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
Mar. 31, 2014
Dec. 31, 2013
Financial assets:    
Securities available for sale $ 520,990 $ 530,926
Accrued interest receivable 7,107 7,055
Investment in federal reserve bank stock 11,196 11,196
Financial liabilities:    
Noninterest-bearing deposits 827,153 819,015
Interest-bearing deposits 1,679,427 1,693,310
Accrued interest payable 3,319 3,366
Carrying or Contract Amount [Member]
   
Financial assets:    
Cash and cash equivalents 204,384 179,357
Securities available for sale 520,990 530,926
Loans receivable, net of allowance for loan losses 2,221,520 2,177,498
Loans held for sale 390   
Accrued interest receivable 7,107 7,055
Investment in federal home loan bank stock 14,060 14,060
Investment in federal reserve bank stock 11,196 11,196
Financial liabilities:    
Noninterest-bearing deposits 827,153 819,015
Interest-bearing deposits 1,679,427 1,693,310
Borrowings 132,445 127,546
Accrued interest payable 3,319 3,366
Off-balance sheet items:    
Commitments to extend credit 268,093 246,161
Standby letters of credit 8,566 8,926
Estimated Fair Value [Member]
   
Financial assets:    
Cash and cash equivalents 204,384 179,357
Securities available for sale 520,990 530,926
Loans receivable, net of allowance for loan losses 2,215,545 2,204,069
Loans held for sale 390   
Accrued interest receivable 7,107 7,055
Investment in federal home loan bank stock 14,060 14,060
Investment in federal reserve bank stock 11,196 11,196
Financial liabilities:    
Noninterest-bearing deposits 827,153 819,015
Interest-bearing deposits 1,682,392 1,693,739
Borrowings 132,451 127,249
Accrued interest payable 3,319 3,366
Off-balance sheet items:    
Commitments to extend credit 193 190
Standby letters of credit $ 23 $ 25