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Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk - Commitments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Company's contractual commitments due to letters of credit    
Total letters of credit $ 35,858 $ 33,288
Allowance for Credit Loss on Unfunded Commitments 4,200  
Allowance for Credit Loss Unfunded Commitment, Purchase Accounting Adjustment 1,500  
Decrease In Allowance for Credit Loss on unfunded Commitments (320,000)  
Fixed [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 692 840
Variable [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 35,166 32,448
Commitments to Extend Credit to Borrowers [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 35,791 33,221
Commitments to Extend Credit to Borrowers [Member] | Fixed [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 692 840
Commitments to Extend Credit to Borrowers [Member] | Variable [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 35,099 32,381
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 19,800 17,858
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 384 384
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 19,416 17,474
Commitments to Extend Credit to Borrowers [Member] | Performance Guarantee [Member]    
Company's contractual commitments due to letters of credit    
Total letters of credit 15,991 15,363
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 308 456
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 15,683 14,907
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 1,017,687 979,890
Letter of Credit [Member] | Unused lines of Credit [Member] | Fixed [Member]    
Company's contractual commitments due to letters of credit    
Loan commitments 107,085 84,225
Letter of Credit [Member] | Unused lines of Credit [Member] | Variable [Member]    
Company's contractual commitments due to letters of credit    
Loan commitments $ 910,602 $ 895,665