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Allowance for Loan Losses - Schedule of Loan Modifications (Detail)
3 Months Ended
Mar. 31, 2021
USD ($)
Loan
Jun. 30, 2020
USD ($)
Loan
Mar. 31, 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 51    
Loans modified as troubled debt restructuring $ 70,660,000    
Percent of Loans Outstanding 3.43%    
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 51    
Loans modified as troubled debt restructuring $ 70,660,000    
Commercial and Agriculture [Member] | Second Modifications [Member] | CARES Act [Member]      
Financing Receivable Modifications [Line Items]      
Number of loans modified | Loan 21    
Loans modified as troubled debt restructuring $ 4,514,000    
Percent of Loans Outstanding 0.22%    
Commercial Real Estate Owner Occupied [Member] | Second Modifications [Member] | CARES Act [Member]      
Financing Receivable Modifications [Line Items]      
Number of loans modified | Loan 8    
Loans modified as troubled debt restructuring $ 10,876,000    
Percent of Loans Outstanding 0.53%    
Commercial Real Estate Non Owner Occupied [Member] | Second Modifications [Member] | CARES Act [Member]      
Financing Receivable Modifications [Line Items]      
Number of loans modified | Loan 18    
Loans modified as troubled debt restructuring $ 48,882,000    
Percent of Loans Outstanding 2.37%    
Residential Real Estate [Member] | Second Modifications [Member] | CARES Act [Member]      
Financing Receivable Modifications [Line Items]      
Number of loans modified | Loan 3    
Loans modified as troubled debt restructuring $ 5,903,000    
Percent of Loans Outstanding 0.29%    
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 $ 485,000    
Percent of Loans Outstanding 0.02%