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Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk - Commitments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Company's contractual commitments due to letters of credit    
Total letters of credit $ 16,210 $ 14,320
Allowance for Credit Loss on Unfunded Commitments 2,200  
Decrease In Allowance for Credit Loss on unfunded Commitments (47,000)  
Fixed [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 861 685
Variable [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 15,349 13,635
Commitments to Extend Credit to Borrowers [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 16,143 14,253
Commitments to Extend Credit to Borrowers [Member] | Fixed [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 861 685
Commitments to Extend Credit to Borrowers [Member] | Variable [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 15,282 13,568
Commitments to Extend Credit to Borrowers [Member] | Financial Standby Letter of Credit [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 8,775 9,380
Commitments to Extend Credit to Borrowers [Member] | Financial Standby Letter of Credit [Member] | Fixed [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 329 329
Commitments to Extend Credit to Borrowers [Member] | Financial Standby Letter of Credit [Member] | Variable [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 8,446 9,051
Commitments to Extend Credit to Borrowers [Member] | Performance Guarantee [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 7,368 4,873
Commitments to Extend Credit to Borrowers [Member] | Performance Guarantee [Member] | Fixed [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 532 356
Commitments to Extend Credit to Borrowers [Member] | Performance Guarantee [Member] | Variable [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 6,836 4,517
Commitments to Extend Credit Nonborrowers [Member] | Performance Guarantee [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 67 67
Commitments to Extend Credit Nonborrowers [Member] | Performance Guarantee [Member] | Variable [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 67 67
Letter of Credit [Member] | Unused lines of Credit [Member]    
Company's contractual commitments due to letters of credit    
Loan commitments 457,687 405,181
Letter of Credit [Member] | Unused lines of Credit [Member] | Fixed [Member]    
Company's contractual commitments due to letters of credit    
Loan commitments 126,753 88,883
Letter of Credit [Member] | Unused lines of Credit [Member] | Variable [Member]    
Company's contractual commitments due to letters of credit    
Loan commitments $ 330,934 $ 316,298