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Borrowing - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]    
Securities sold under agreements to repurchase $ 136,118,000 $ 129,208,000
Payment of purchase agreement 12,259,000  
Convertible and callable advances 161,558,000 150,000,000
Fixed rate credit 6,270,000  
Qualifying loans 998,140,000 693,330,000
Unused borrowing capacity 269,330,000  
FHLB borrowing amount 37,270,000  
FHLB borrowing amount paid 25,710,000  
Junior subordinated debentures issued 15,460,000  
Libor rate 2.95%  
Maximum percentage of restricted core capital to all core capital that may be included in tier 1 capital 25.00%  
Retail Overnight And Term Repurchase Agreement
    
Debt Instrument [Line Items]    
Securities sold under agreements to repurchase 77,920,000 79,210,000
Wholesale Repurchase Agreement
    
Debt Instrument [Line Items]    
Securities sold under agreements to repurchase 58,200,000 50,000,000
Weighted average contractual rate of the wholesale repurchase agreements 3.34% 3.65%
Weighted average maturity of the wholesale repurchase agreements 5 years 22 days  
Repurchase amount 20,040,000  
Payment of purchase agreement 11,840,000  
Convertible And Callable Advances
    
Debt Instrument [Line Items]    
Weighted average contractual rate of the wholesale repurchase agreements 3.86% 4.12%
Weighted average maturity of the wholesale repurchase agreements 5 years 2 months 23 days  
Convertible and callable advances $ 155,280,000 $ 150,000,000