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Business Combinations - Additional Information (Detail)
 3 Months Ended
Feb. 29, 2016
USD ($)
Branch
Mar. 31, 2016
USD ($)
Mar. 31, 2015
USD ($)
Mar. 01, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]          
Acquisition date   Oct. 16, 2009      
Goodwill   $ 88,174,000     $ 74,244,000
Non-recurring merger related expenses   $ 849,000 $ 0    
County Commerce Bank [Member]          
Business Acquisition [Line Items]          
Acquisition date   Feb. 29, 2016      
Number of branches owned by merger company | Branch 4        
Acquired assets and assumed liabilities, cash $ 20,600,000        
Assets and assumed all of the liabilities, stock 21,600,000        
Goodwill       $ 13,900,000  
Total fair value of assets acquired 252,400,000        
Cash and balances due from depository institutions 54,800,000        
FHLB stock 1,500,000        
Loans and lease finance receivables 168,000,000        
Fixed assets 8,600,000        
Core deposit intangible assets 3,900,000        
Other assets 1,700,000        
Total fair value of liabilities assumed 230,800,000        
Deposits 224,200,000        
Other liabilities 1,600,000        
FHLB advances $ 5,000,000        
Non-recurring merger related expenses   $ 849,000