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Borrowings - Additional Information (Detail) (USD $)
 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Securities sold under agreements to repurchase $ 121,204,000 $ 136,118,000
Convertible and callable advances 150,000,000 161,558,000
Fixed rate credit   6,270,000
FHLB borrowing amount paid 11,470,000  
Gain on repayment of FHLB borrowings 296,000  
Qualifying loans 1,040,000 998,140,000
Unused borrowing capacity 294,830,000  
Junior subordinated debentures issued 15,460,000  
Libor rate 2.95%  
Federal Home Loan Bank Borrowings
    
Debt Instrument [Line Items]    
Gain on repayment of FHLB borrowings 217,000  
Federal Home Loan Bank Borrowings | Minimum
    
Debt Instrument [Line Items]    
FHLB borrowings contractual maturities 3 years  
Federal Home Loan Bank Borrowings | Maximum
    
Debt Instrument [Line Items]    
FHLB borrowings contractual maturities 8 years  
Retail Overnight And Term Repurchase Agreement
    
Debt Instrument [Line Items]    
Securities sold under agreements to repurchase 71,200,000 77,920,000
Convertible And Callable Advances
    
Debt Instrument [Line Items]    
Weighted average contractual rate of the wholesale repurchase agreements 4.12% 3.86%
Convertible and callable advances 150,000,000 155,280,000
Wholesale Repurchase Agreement
    
Debt Instrument [Line Items]    
Securities sold under agreements to repurchase 50,000,000 58,200,000
Weighted average contractual rate of the wholesale repurchase agreements 3.71% 3.34%
Payment of purchase agreement 8,150,000  
Gain on payment of repurchase agreement $ 79,000