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Borrowings - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Mar. 31, 2007
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2007
USD ($)
Security
Dec. 31, 2014
USD ($)
Dec. 30, 2014
USD ($)
Borrowings Under Repurchase Agreements [Line items]          
Line of credit facility, maximum borrowing capacity   $ 10,000,000   $ 10,000,000  
Line of credit, outstanding amount   0   $ 0  
FHLB borrowings, available capacity   392,986,000      
FHLB borrowings, pledge of selected securities, loan covered amount   20,619,000      
FHLB borrowings, pledge on certain loans, loan covered amount   $ 802,174,000      
Borrowings from unaffiliated entities, interest rate   5.25%   5.25%  
Issuance of preferred securities | Security     2    
Unaffiliated institution 1 [Member]          
Borrowings Under Repurchase Agreements [Line items]          
Borrowings under US treasury         $ 0
Unaffiliated Institution [Member]          
Borrowings Under Repurchase Agreements [Line items]          
Borrowings from unaffiliated entities, transaction amount $ 10,000,000        
Borrowings securities pledged under certain transaction   $ 11,710,000      
Borrowing maturity date   Mar. 20, 2017      
Over Night Borrowings [Member] | Unaffiliated institution 1 [Member]          
Borrowings Under Repurchase Agreements [Line items]          
Borrowings under US treasury   $ 0      
Subordinated Debentures [Member]          
Borrowings Under Repurchase Agreements [Line items]          
Issue of floating rate trust preferred securities     $ 10,000,000    
Trust preferred securities, interest payment deferment period maximum   5 years      
Borrowings, floating interest rate description   floats based on the 3 month LIBOR plus 1.55% and was 2.06% at December 31, 2015 and 1.79% at December 31, 2014.      
Line of credit, basis spread on LIBOR   1.55%      
Trust preferred securities, period end interest rate   2.06%   1.79%  
Trust preferred securities, redemption year maximum   2037