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Troubled Debt Restructurings (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Loans
Customer
Jun. 30, 2020
USD ($)
Loans
Jun. 30, 2021
USD ($)
Loans
Customer
Jun. 30, 2020
USD ($)
Loans
Dec. 31, 2020
USD ($)
Financing Receivable Modifications [Line Items]          
Total troubled debt restructurings $ 4,000,000.0   $ 4,000,000.0   $ 4,100,000
Commitments to lend additional amounts to borrowers classified as troubled debt restructurings 0   0   0
Small Business Administration (SBA), CARES Act, Paycheck Protection Program          
Financing Receivable Modifications [Line Items]          
Total troubled debt restructurings $ 199,800,000   $ 199,800,000    
Number of business customers facilitated assistance | Customer 1,714   1,714    
Payments received from forgiveness of loans $ 83,900,000        
Small Business Administration (SBA), CARES Act, Paycheck Protection Program | PPP Loan Originated In 2020          
Financing Receivable Modifications [Line Items]          
Payments received from forgiveness of loans     $ 181,600,000    
Percentage of payments received from forgiveness of loans     90.80%    
Small Business Administration (SBA), CARES Act, Paycheck Protection Program | PPP Loan Originated In 2021          
Financing Receivable Modifications [Line Items]          
Payments received from forgiveness of loans $ 5,200,000        
Percentage of payments received from forgiveness of loans 6.20%        
Consumer, Indirect          
Financing Receivable Modifications [Line Items]          
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans 1   1    
Payment Deferral          
Financing Receivable Modifications [Line Items]          
Number of months offered, deferrals     3 months    
Residential Mortgage          
Financing Receivable Modifications [Line Items]          
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans 1   1    
Loans default payment past due period       30 days  
Provision for loan losses         0
Commercial loans          
Financing Receivable Modifications [Line Items]          
Provision for loan losses     $ 0    
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans 2 1 2 1  
Financing receivable number of loans past due | Loans     2    
Loans default payment past due period     30 days    
Commercial farmland loans          
Financing Receivable Modifications [Line Items]          
Troubled debt restructured loans with subsequent payment defaults | Loans | Loans   2   2  
Minimum | Payment Deferral          
Financing Receivable Modifications [Line Items]          
Number of months offered, deferrals     3 months    
Maximum | Payment Deferral          
Financing Receivable Modifications [Line Items]          
Number of months offered, deferrals     12 months    
Troubled debt restructurings          
Financing Receivable Modifications [Line Items]          
Specific reserves to loans $ 88,000   $ 88,000   $ 81,000
Allowance adjustment charge offs 106,000 $ 34,000 126,000 $ 39,000  
Provision for loan losses $ 105,000 $ 32,000 $ 125,000 $ 37,000  
Extended Maturity          
Financing Receivable Modifications [Line Items]          
Maturity period loans   183 months      
Extended Maturity | Minimum          
Financing Receivable Modifications [Line Items]          
Maturity period loans 120 months   22 days 168 months  
Extended Maturity | Maximum          
Financing Receivable Modifications [Line Items]          
Maturity period loans 361 months   361 months 183 months  
Contractual Interest Rate Reduction          
Financing Receivable Modifications [Line Items]          
Reduction of the notes stated interest rate   2.25% 4.075%    
Contractual Interest Rate Reduction | Minimum          
Financing Receivable Modifications [Line Items]          
Reduction of the notes stated interest rate       1.00%  
Contractual Interest Rate Reduction | Maximum          
Financing Receivable Modifications [Line Items]          
Reduction of the notes stated interest rate       2.25%