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Allowance for Loan Losses - Schedule of Loan Modifications (Detail)
3 Months Ended 9 Months Ended
Jun. 30, 2020
USD ($)
Loan
Sep. 30, 2021
USD ($)
Loan
Sep. 30, 2020
USD ($)
Financing Receivable Modifications [Line Items]      
Loans modified as troubled debt restructuring   $ 0 $ 0
Second Modifications [Member] | CARES Act [Member]      
Financing Receivable Modifications [Line Items]      
Number of loans modified | Loan   18  
Loans modified as troubled debt restructuring   $ 18,787,000  
Percent of Loans Outstanding   0.94%  
Commercial and Agriculture [Member]      
Financing Receivable Modifications [Line Items]      
Number of loans modified | Loan 813    
Loans modified as troubled debt restructuring $ 431,300,000    
Commercial and Agriculture [Member] | Second Modifications [Member]      
Financing Receivable Modifications [Line Items]      
Number of loans modified | Loan   18  
Loans modified as troubled debt restructuring   $ 18,787,000  
Commercial and Agriculture [Member] | Second Modifications [Member] | CARES Act [Member]      
Financing Receivable Modifications [Line Items]      
Number of loans modified | Loan   6  
Loans modified as troubled debt restructuring   $ 1,571,000  
Percent of Loans Outstanding   0.08%  
Commercial Real Estate Owner Occupied [Member] | Second Modifications [Member] | CARES Act [Member]      
Financing Receivable Modifications [Line Items]      
Number of loans modified | Loan   2  
Loans modified as troubled debt restructuring   $ 2,591,000  
Percent of Loans Outstanding   0.13%  
Commercial Real Estate Non Owner Occupied [Member] | Second Modifications [Member] | CARES Act [Member]      
Financing Receivable Modifications [Line Items]      
Number of loans modified | Loan   9  
Loans modified as troubled debt restructuring   $ 14,174,000  
Percent of Loans Outstanding   0.71%  
Real Estate Construction [Member] | Second Modifications [Member] | CARES Act [Member]      
Financing Receivable Modifications [Line Items]      
Number of loans modified | Loan   1  
Loans modified as troubled debt restructuring   $ 451,000  
Percent of Loans Outstanding   0.02%