Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Estimated Fair Values of Financial Instruments (Detail)

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Fair Value Measurements - Estimated Fair Values of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Financial assets:    
Securities available for sale $ 505,977 $ 530,926
Accrued interest receivable 6,355 7,055
Investment in federal reserve bank stock 11,514 11,196
Financial liabilities:    
Noninterest-bearing deposits 910,320 819,015
Interest-bearing deposits 1,634,529 1,693,310
Accrued interest payable 3,423 3,366
Carrying Amount [Member]
   
Financial assets:    
Cash and cash equivalents 123,782 179,357
Securities available for sale 505,977 530,926
Loans receivable, net of allowance for loan losses 2,300,810 2,177,498
Loans held for sale 3,842   
Accrued interest receivable 6,355 7,055
Investment in federal home loan bank stock 16,385 14,060
Investment in federal reserve bank stock 11,514 11,196
Financial liabilities:    
Noninterest-bearing deposits 910,320 819,015
Interest-bearing deposits 1,634,529 1,693,310
Borrowings 97,000 127,546
Accrued interest payable 3,423 3,366
Off-balance sheet items:    
Commitments to extend credit 271,225 246,161
Standby letters of credit 8,310 8,926
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets [Member]
   
Financial assets:    
Cash and cash equivalents 123,782 179,357
Securities available for sale 77,864 103,533
Loans receivable, net of allowance for loan losses     
Loans held for sale     
Accrued interest receivable 6,355 7,055
Investment in federal home loan bank stock 16,385 14,060
Investment in federal reserve bank stock 11,514 11,196
Financial liabilities:    
Noninterest-bearing deposits     
Interest-bearing deposits     
Borrowings     
Accrued interest payable 3,423 3,366
Off-balance sheet items:    
Commitments to extend credit     
Standby letters of credit     
Fair Value [Member] | Significant Observable Inputs with No Active Market with Identical Characteristics [Member]
   
Financial assets:    
Cash and cash equivalents     
Securities available for sale 427,385 426,645
Loans receivable, net of allowance for loan losses     
Loans held for sale 3,842   
Accrued interest receivable     
Investment in federal home loan bank stock     
Investment in federal reserve bank stock     
Financial liabilities:    
Noninterest-bearing deposits 910,320 819,015
Interest-bearing deposits     
Borrowings     
Accrued interest payable     
Off-balance sheet items:    
Commitments to extend credit     
Standby letters of credit     
Fair Value [Member] | Significant Unobservable Inputs [Member]
   
Financial assets:    
Cash and cash equivalents     
Securities available for sale 728 748
Loans receivable, net of allowance for loan losses 2,298,104 2,204,069
Loans held for sale     
Accrued interest receivable     
Investment in federal home loan bank stock     
Investment in federal reserve bank stock     
Financial liabilities:    
Interest-bearing deposits 1,622,879 1,693,739
Borrowings 97,000 127,249
Accrued interest payable     
Off-balance sheet items:    
Commitments to extend credit 271,225 246,161
Standby letters of credit $ 8,310 $ 8,926