Quarterly report pursuant to Section 13 or 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
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales $ 400,815 $ 451,060
Stock Warrants 5 906
Total debt securities available-for-sale [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales 400,076 450,668
Financial services industry [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales 739 392
Equity securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales 739 392
Mortgage-backed securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales 124,618 160,326
Collateralized mortgage obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales 84,848 100,487
U.S. government agency securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales 97,604 93,118
Municipal bonds-tax exempt [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales 10,651 12,812
Municipal bonds-taxable [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales 45,546 46,142
Corporate bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales 20,375 20,400
SBA loan pools securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales 13,501 14,026
Other securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales 2,933 3,357
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 securities available-for-sales 98,343 93,510
Stock Warrants      
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 securities available-for-sales 97,604 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 securities available-for-sales 739 392
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 securities available-for-sales 739 392
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 securities available-for-sales 301,710 356,771
Stock Warrants      
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 securities available-for-sales 301,710 356,771
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 securities available-for-sales      
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 securities available-for-sales      
Recurring Basis (Member] | Significant Unobservable Inputs [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales 762 779
Stock Warrants 5 906
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 securities available-for-sales 762 779
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 securities available-for-sales      
Recurring Basis (Member] | Significant Unobservable Inputs [Member] | Equity securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales      
Recurring Basis (Member] | Mortgage-backed 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 securities available-for-sales      
Recurring Basis (Member] | Mortgage-backed 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 securities available-for-sales 124,618 160,326
Recurring Basis (Member] | Mortgage-backed securities [Member] | Significant Unobservable Inputs [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales      
Recurring Basis (Member] | Collateralized mortgage obligations [Member] | Quoted Prices in Active Markets for Identical Assets [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales      
Recurring Basis (Member] | Collateralized mortgage obligations [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 securities available-for-sales 84,848 100,487
Recurring Basis (Member] | Collateralized mortgage obligations [Member] | Significant Unobservable Inputs [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales      
Recurring Basis (Member] | U.S. government agency 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 securities available-for-sales 97,604 93,118
Recurring Basis (Member] | U.S. government agency 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 securities available-for-sales      
Recurring Basis (Member] | U.S. government agency securities [Member] | Significant Unobservable Inputs [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales      
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 securities available-for-sales      
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 securities available-for-sales 9,889 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 securities available-for-sales 762 779
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 securities available-for-sales      
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 securities available-for-sales 45,546 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 securities available-for-sales      
Recurring Basis (Member] | Corporate bonds [Member] | Quoted Prices in Active Markets for Identical Assets [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales      
Recurring Basis (Member] | Corporate bonds [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 securities available-for-sales 20,375 20,400
Recurring Basis (Member] | Corporate bonds [Member] | Significant Unobservable Inputs [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales      
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 securities available-for-sales      
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 securities available-for-sales 13,501 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 securities available-for-sales      
Recurring Basis (Member] | Other 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 securities available-for-sales      
Recurring Basis (Member] | Other 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 securities available-for-sales 2,933 3,357
Recurring Basis (Member] | Other securities [Member] | Significant Unobservable Inputs [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available-for-sales