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Borrowings - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended
Mar. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Debt Instrument [Line Items]        
Securities sold under agreements to repurchase   $ 114,647,000   $ 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   1,100,000,000   998,140,000
Unused borrowing capacity   325,720,000    
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   64,650,000   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