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Allowance for Loan Losses - Schedule of Loan Modifications (Detail)
3 Months Ended
Mar. 31, 2022
USD ($)
Loan
Jun. 30, 2020
USD ($)
Loan
Mar. 31, 2021
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 5    
Loans modified as troubled debt restructuring $ 2,764,000    
Percent of Loans Outstanding 0.14%    
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 5    
Loans modified as troubled debt restructuring $ 2,764,000    
Commercial and Agriculture [Member] | Second Modifications [Member] | CARES Act [Member]      
Financing Receivable Modifications [Line Items]      
Number of loans modified | Loan 1    
Loans modified as troubled debt restructuring $ 245,000    
Percent of Loans Outstanding 0.01%    
Commercial Real Estate Non Owner Occupied [Member] | Second Modifications [Member] | CARES Act [Member]      
Financing Receivable Modifications [Line Items]      
Number of loans modified | Loan 4    
Loans modified as troubled debt restructuring $ 2,519,000    
Percent of Loans Outstanding 0.12%