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Business Combinations - Additional Information (Detail)
$ in Thousands
12 Months Ended
May. 15, 2014
USD ($)
Branches
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
Branches
Dec. 31, 2013
USD ($)
Business Acquisition [Line Items]          
Acquisition date   Oct. 16, 2009      
Goodwill   $ 74,244 $ 74,244   $ 55,097
Non-recurring merger related expenses   475 $ 1,973    
American Security Bank [Member]          
Business Acquisition [Line Items]          
Acquisition date     May 15, 2014    
Acquired assets and assumed liabilities for cash $ 57,000        
Number of branches owned by merger company | Branches 5        
Goodwill $ 19,100        
Total fair value of assets acquired 436,400        
Cash and cash due from banks 117,800        
Investment securities available for sale 44,500        
FHLB stock 1,900        
Loans receivable 242,700        
Fixed assets 4,800        
Core deposit intangible assets 2,100        
Other real estate owned 1,600        
Other assets 1,800        
Total fair value of liabilities assumed 379,400        
Deposits 378,400        
Other liabilities $ 1,000        
Non-recurring merger related expenses   $ 0 $ 2,000    
American Security Bank [Member] | Electronic Branch [Member]          
Business Acquisition [Line Items]          
Number of branches owned by merger company | Branches 2        
Number of banking vestibules closed | Branches       2  
American Security Bank [Member] | Loan Production Office [Member]          
Business Acquisition [Line Items]          
Number of branches owned by merger company | Branches 1