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Business Combinations - Additional Information (Detail)
 12 Months Ended
Mar. 10, 2017
USD ($)
Branch
Feb. 29, 2016
USD ($)
Branch
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Business Acquisition [Line Items]          
Acquisition date     Oct. 16, 2009    
Goodwill     $ 116,564,000 $ 89,533,000 $ 74,244,000
Merger related expenses     $ 2,251,000 1,897,000 $ 475,000
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     $ 2,100,000    
Valley Business Bank [Member]          
Business Acquisition [Line Items]          
Number of branches owned by merger company | Branch 4        
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 for cash   $ 20,600,000      
Assets and assumed all of the liabilities, stock   21,600,000      
Goodwill   15,300,000      
Total fair value of assets acquired   252,400,000      
Cash and cash equivalents   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   289,000      
Total fair value of liabilities assumed   230,800,000      
Deposits   224,200,000      
Other liabilities   1,600,000      
Merger related expenses     $ 145,000 $ 1,400,000  
FHLB advances   $ 5,000,000