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Business Combinations - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Aug. 10, 2018
USD ($)
Mar. 10, 2017
USD ($)
Branch
Dec. 31, 2019
USD ($)
Branch
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2019
Banking
Branch
Business Acquisition [Line Items]            
Number of branches owned by merger company | Banking           10
Goodwill     $ 663,707 $ 666,539 $ 116,564  
Merger related expenses     $ 6,447 $ 16,404 2,251  
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        
Core deposit intangible assets   3,200        
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        
Other assets   21,000        
Total fair value of liabilities assumed   368,300        
Deposits   361,800        
Other liabilities   $ 6,500        
Merger related expenses         $ 2,100  
Valley Business Bank [Member]            
Business Acquisition [Line Items]            
Number of branches owned by merger company | Branch   4        
Community Bank [Member]            
Business Acquisition [Line Items]            
Acquisition date     Aug. 10, 2018      
Number of branches owned by merger company | Branch     16     10
Acquired assets and assumed liabilities for cash $ 180,719          
Assets and assumed all of the liabilities, stock 722,767          
Goodwill 547,144          
Core deposit intangible assets $ 52,200          
Percentage of core deposits to total deposits 2.26%          
Total fair value of assets acquired $ 3,719,091          
Cash and cash equivalents 47,802          
FHLB stock 17,250          
Loans and lease finance receivables 2,738,100          
Bank-Owned Life Insurance 70,904          
Other assets 53,291          
Total fair value of liabilities assumed 356,342          
Deposits 2,869,986          
Other liabilities 29,192          
Merger related expenses     $ 6,400 $ 16,400    
Gross contractual amount receivable, as of acquisition date 3,000,000          
Contractual principal cash flows, loans not expected to be collected $ 4,500