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Borrowings - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
Mar. 31, 2007
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2007
USD ($)
Security
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     395,858,000      
FHLB borrowings, pledge of selected securities, loan covered amount     15,586,000      
FHLB borrowings, pledge on certain loans, loan covered amount     $ 963,626,000      
Borrowings from unaffiliated entities, interest rate     5.25% 5.25%    
Issuance of preferred securities | Security           2
Proceeds from subordinated borrowings $ 50,000,000   $ 50,000,000 $ 0 $ 0  
Fixed Interest rate loan 5.75%          
London Interbank Offered Rate (LIBOR) [Member]            
Borrowings Under Repurchase Agreements [Line items]            
Interest rate 4.55%          
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     $ 11,416,000      
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 2.51% at December 31, 2016 and 2.06% at December 31, 2015.      
Line of credit, basis spread on LIBOR     1.55%      
Trust preferred securities, period end interest rate     2.51% 2.06%    
Trust preferred securities, redemption year maximum     2037