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
Sep. 30, 2013
Dec. 31, 2012
Financial assets:    
Restricted cash   $ 5,350
Investment securities available-for-sale 383,057 451,060
Accrued interest receivable 6,957 7,581
Investment in federal reserve bank stock 13,200 12,222
Financial liabilities:    
Noninterest-bearing deposits 778,345 720,931
Interest-bearing deposits 1,651,362 1,675,032
Accrued interest payable 2,705 11,775
Carrying or Contract Amount [Member]
   
Financial assets:    
Cash and cash equivalents 193,854 268,047
Restricted cash   5,350
Investment securities available-for-sale 383,057 451,060
Loans receivable, net of allowance for loan losses 2,102,621 1,986,051
Loans held for sale 5,228 8,306
Accrued interest receivable 6,957 7,581
Investment in federal home loan bank stock 14,060 17,800
Investment in federal reserve bank stock 13,200 12,222
Financial liabilities:    
Noninterest-bearing deposits 778,345 720,931
Interest-bearing deposits 1,651,362 1,675,032
Borrowings 2,645 85,341
Accrued interest payable 2,705 11,775
Off-balance sheet items:    
Commitments to extend credit 225,070 182,746
Standby letters of credit 9,326 10,588
Estimated Fair Value [Member]
   
Financial assets:    
Cash and cash equivalents 193,854 268,047
Restricted cash   5,350
Investment securities available-for-sale 383,057 451,060
Loans receivable, net of allowance for loan losses 2,096,928 1,981,669
Loans held for sale 5,228 8,306
Accrued interest receivable 6,957 7,581
Investment in federal home loan bank stock 14,060 17,800
Investment in federal reserve bank stock 13,200 12,222
Financial liabilities:    
Noninterest-bearing deposits 778,345 720,931
Interest-bearing deposits 1,656,011 1,680,211
Borrowings 2,674 85,414
Accrued interest payable 2,705 11,775
Off-balance sheet items:    
Commitments to extend credit 190 146
Standby letters of credit $ 42 $ 24