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Business Combinations - Additional Information (Detail)
 3 Months Ended
Mar. 10, 2017
USD ($)
Branch
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]        
Acquisition date   Oct. 16, 2009    
Goodwill   $ 116,564,000 $ 119,193,000 $ 116,564,000
Merger related expenses   $ 803,000 676,000  
Valley Commerce Bancorp [Member]        
Business Acquisition [Line Items]        
Acquisition date   Mar. 10, 2017    
Acquired assets and assumed liabilities for cash $ 23,200,000      
Assets and assumed all of the liabilities, stock 37,600,000      
Goodwill 27,000,000      
Total fair value of assets acquired 405,900,000      
Cash and cash equivalents 28,300,000      
FHLB stock 2,000,000      
Loans and lease finance receivables 309,700,000      
Fixed assets 5,300,000      
Bank-Owned Life Insurance 9,400,000      
Core deposit intangible assets 3,200,000      
Other assets 21,000,000      
Total fair value of liabilities assumed 368,300,000      
Deposits 361,800,000      
Other liabilities $ 6,500,000      
Merger related expenses   $ 0 $ 651,000  
Valley Business Bank [Member]        
Business Acquisition [Line Items]        
Number of branches owned by merger company | Branch 4