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Business Combinations - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 10, 2017
USD ($)
Branch
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]            
Acquisition date       Oct. 16, 2009    
Goodwill   $ 116,564 $ 119,193 $ 116,564 $ 119,193 $ 116,564
Merger related expenses   $ 494 1,250 $ 1,297 1,926  
Valley Commerce Bancorp [Member]            
Business Acquisition [Line Items]            
Acquisition date       Mar. 10, 2017    
Acquired assets and assumed liabilities for cash $ 23,200          
Assets and assumed all of the liabilities, stock 37,600          
Goodwill 27,000          
Total fair value of assets acquired 405,900          
Cash and cash equivalents 28,300          
FHLB stock 2,000          
Loans and lease finance receivables 309,700          
Fixed assets 5,300          
Bank-Owned Life Insurance 9,400          
Core deposit intangible assets 3,200          
Other assets 21,000          
Total fair value of liabilities assumed 368,300          
Deposits 361,800          
Other liabilities $ 6,500          
Merger related expenses     $ 1,300 $ 1,300 $ 1,900  
Valley Business Bank [Member]            
Business Acquisition [Line Items]            
Number of branches owned by merger company | Branch 4