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Loans - Additional Information (Detail)
9 Months Ended
Sep. 30, 2020
USD ($)
Loan
Contract
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 2,040,940,000 $ 1,708,970,000  
Net deferred loan fees $ 8,208,000 488,000  
Number of loans modified | Contract 1    
Loans modified as troubled debt restructuring $ 0   $ 0
CARES Act [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans modified | Loan 813    
Loans modified as troubled debt restructuring $ 431,283,000    
CARES Act [Member] | Second Modifications [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans modified | Loan 47    
Loans modified as troubled debt restructuring $ 52,186,000    
Paycheck Protection Program Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net deferred loan fees 7,498,000    
Commercial and Agriculture [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 435,285,000 $ 203,110,000  
Commercial and Agriculture [Member] | CARES Act [Member] | Second Modifications [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans modified | Loan 12    
Loans modified as troubled debt restructuring $ 1,370,000    
Commercial and Agriculture [Member] | Paycheck Protection Program Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 259,097,000