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Loans - Additional Information (Detail)
6 Months Ended
Jun. 30, 2020
USD ($)
Loan
Jun. 30, 2019
USD ($)
Contract
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 2,022,965,000   $ 1,708,970,000
Net deferred loan fees 9,303,000   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    
Paycheck Protection Program Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Net deferred loan fees 8,678,000    
Commercial and Agriculture [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 442,444,000   $ 203,110,000
Commercial and Agriculture [Member] | CARES Act [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans modified | Loan 229    
Loans modified as troubled debt restructuring $ 47,686,000    
Commercial and Agriculture [Member] | Paycheck Protection Program Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Loans $ 257,568,000