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Borrowings - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2007
Security
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Unaffiliated institution 1 [Member]
Dec. 31, 2012
Unaffiliated institution 1 [Member]
Mar. 31, 2007
Unaffiliated Institution [Member]
Dec. 31, 2013
Unaffiliated Institution [Member]
Dec. 31, 2013
Subordinated Debentures [Member]
Dec. 31, 2012
Subordinated Debentures [Member]
Dec. 31, 2007
Subordinated Debentures [Member]
Dec. 31, 2013
Over Night Borrowings [Member]
Unaffiliated institution 1 [Member]
Dec. 31, 2012
Over Night Borrowings [Member]
Unaffiliated institution 1 [Member]
Borrowings Under Repurchase Agreements [Line items]                        
Line of credit facility, maximum borrowing capacity   $ 10,000,000 $ 9,000,000                  
Line of credit, outstanding amount   0 0                  
FHLB borrowings, available capacity   348,574,000                    
FHLB borrowings, pledge of selected securities, loan covered amount   75,885,000                    
FHLB borrowings, pledge on certain loans, loan covered amount   469,822,000                    
Borrowings under US treasury                     12,950,000 23,510,000
Borrowings from unaffiliated entities, interest rate   5.25% 5.25% 0.35% 0.35%              
Borrowings from unaffiliated entities, transaction amount           10,000,000            
Borrowings securities pledged under certain transaction             12,222,000          
Borrowing maturity date             Mar. 20, 2017          
Borrowings, floating interest rate description             Variable interest rate of 3 month LIBOR minus 1.0% Floats based on the 3 month LIBOR plus 1.55% and was 1.79% and 1.86% Floats based on the 3 month LIBOR plus 1.55% and was 1.79% and 1.86%      
Line Of Credit, Basis Spread on LIBOR             1.00% 1.55%        
Issue of floating rate trust preferred securities                   $ 10,000,000    
Trust preferred securities, interest payment deferment period maximum               5 years        
Trust preferred securities, period end interest rate               1.79% 1.86%      
Trust preferred securities, redemption year maximum               2037        
Issuance of preferred securities 2