Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail)

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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale $ 530,926 $ 451,060
Stock warrants 2 906
Mortgage-backed securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 217,059 160,326
U.S. government agency securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 83,536 93,118
Corporate bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 20,835 20,400
Other securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 2,886 3,357
Total debt securities available-for-sale [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 530,926 450,668
Financial services industry [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale   392
Equity securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale   392
Collateralized mortgage obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 127,693 100,487
Municipal bonds-tax exempt [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 13,937 12,812
Municipal bonds-taxable [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 32,354 46,142
SBA loan pools securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 12,629 14,026
U.S. treasury bills [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 19,997  
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 103,533 93,510
Stock warrants      
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets [Member] | Mortgage-backed securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale      
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets [Member] | U.S. government agency securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 83,536 93,118
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets [Member] | Corporate bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale      
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets [Member] | Other securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale      
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets [Member] | Total debt securities available-for-sale [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 103,533 93,118
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets [Member] | Financial services industry [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale   392
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets [Member] | Equity securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale   392
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets [Member] | Collateralized mortgage obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale      
Recurring Basis [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 426,645 356,771
Stock warrants      
Recurring Basis [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] | Mortgage-backed securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 217,059 160,326
Recurring Basis [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] | U.S. government agency securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale      
Recurring Basis [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] | Corporate bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 20,835 20,400
Recurring Basis [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] | Other securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 2,886 3,357
Recurring Basis [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] | Total debt securities available-for-sale [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 426,645 356,771
Recurring Basis [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] | Financial services industry [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale     
Recurring Basis [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] | Equity securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale     
Recurring Basis [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member] | Collateralized mortgage obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 127,693 100,487
Recurring Basis [Member] | Significant Unobservable Inputs [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 748 779
Stock warrants 2 906
Recurring Basis [Member] | Significant Unobservable Inputs [Member] | Mortgage-backed securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale      
Recurring Basis [Member] | Significant Unobservable Inputs [Member] | U.S. government agency securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale      
Recurring Basis [Member] | Significant Unobservable Inputs [Member] | Corporate bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale      
Recurring Basis [Member] | Significant Unobservable Inputs [Member] | Other securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale      
Recurring Basis [Member] | Significant Unobservable Inputs [Member] | Total debt securities available-for-sale [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 748 779
Recurring Basis [Member] | Significant Unobservable Inputs [Member] | Financial services industry [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale     
Recurring Basis [Member] | Significant Unobservable Inputs [Member] | Equity securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale     
Recurring Basis [Member] | Significant Unobservable Inputs [Member] | Collateralized mortgage obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale      
Recurring Basis [Member] | Municipal bonds-tax exempt [Member] | Quoted Prices in Active Markets for Identical Assets [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale      
Recurring Basis [Member] | Municipal bonds-tax exempt [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 13,189 12,033
Recurring Basis [Member] | Municipal bonds-tax exempt [Member] | Significant Unobservable Inputs [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 748 779
Recurring Basis [Member] | Municipal bonds-taxable [Member] | Quoted Prices in Active Markets for Identical Assets [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale      
Recurring Basis [Member] | Municipal bonds-taxable [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 32,354 46,142
Recurring Basis [Member] | Municipal bonds-taxable [Member] | Significant Unobservable Inputs [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale      
Recurring Basis [Member] | SBA loan pools securities [Member] | Quoted Prices in Active Markets for Identical Assets [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale      
Recurring Basis [Member] | SBA loan pools securities [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 12,629 14,026
Recurring Basis [Member] | SBA loan pools securities [Member] | Significant Unobservable Inputs [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale      
Recurring Basis [Member] | U.S. treasury bills [Member] | Quoted Prices in Active Markets for Identical Assets [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale 19,997  
Recurring Basis [Member] | U.S. treasury bills [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale     
Recurring Basis [Member] | U.S. treasury bills [Member] | Significant Unobservable Inputs [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total debt securities available for sale