Quarterly report pursuant to Section 13 or 15(d)

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

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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Securities Available for Sales $ 410,210 $ 381,862
Stock Warrants 1,060 883
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 409,919 381,181
Financial Services Industry [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Securities Available for Sales 291 681
Total Equity Securities Available For Sale [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Securities Available for Sales 291 681
Residential Mortgage Backed Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Securities Available for Sales 142,168 113,005
Collateralized Mortgage Obligations [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Securities Available for Sales 101,390 162,837
U.S. Government Agencies Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Securities Available for Sales 79,164 72,548
Municipal Bonds-Tax Exempt [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Securities Available for Sales 12,738 3,482
Municipal Bonds-Taxable [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Securities Available for Sales 46,234 6,138
Corporate Bonds [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Securities Available for Sales 19,897 19,836
Other Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Securities Available for Sales 8,328 3,335
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 79,455 73,229
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 79,164 72,548
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 291 681
Quoted Prices in Active Markets for Identical Assets [Member] | Total Equity Securities Available For Sale [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Securities Available for Sales 291 681
Quoted Prices in Active Markets for Identical Assets [Member] | U.S. Government Agencies Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Securities Available for Sales 79,164 72,548
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 329,967 308,633
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 329,967 308,633
Significant Observable Inputs With No Active Market With Identical Characteristics [Member] | Residential Mortgage Backed Securities [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Securities Available for Sales 142,168 113,005
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 Securities Available for Sales 101,390 162,837
Significant Observable Inputs With No Active Market With Identical Characteristics [Member] | Municipal Bonds-Tax Exempt [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Securities Available for Sales 11,950 3,482
Significant Observable Inputs With No Active Market With Identical Characteristics [Member] | Municipal Bonds-Taxable [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Securities Available for Sales 46,234 6,138
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 Securities Available for Sales 19,897 19,836
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 Securities Available for Sales 8,328 3,335
Significant Unobservable Inputs [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Securities Available for Sales 788  
Stock Warrants 1,060 883
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 788  
Significant Unobservable Inputs [Member] | Municipal Bonds-Tax Exempt [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Securities Available for Sales $ 788