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Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk - Commitments (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Company's contractual commitments due to letters of credit      
Total letters of credit $ 32,577,000 $ 32,577,000 $ 36,096,000
Allowance for credit loss on unfunded commitments 2,700,000 2,700,000  
Allowance for credit loss unfunded commitment, purchase accounting adjustment 372,000 372,000  
Decrease In allowance for credit loss on unfunded commitments 650,000    
Commercial unfunded commitments assumptions for decrease in the allowance for credit losses   427,000  
Accretion of interest income for decrease in the allowance for credit losses   223,000  
Fixed [Member]      
Company's contractual commitments due to letters of credit      
Total letters of credit 3,629,000 3,629,000 6,675,000
Variable [Member]      
Company's contractual commitments due to letters of credit      
Total letters of credit 28,948,000 28,948,000 29,421,000
Commitments to Extend Credit to Borrowers [Member]      
Company's contractual commitments due to letters of credit      
Total letters of credit 32,510,000 32,510,000 36,029,000
Commitments to Extend Credit to Borrowers [Member] | Fixed [Member]      
Company's contractual commitments due to letters of credit      
Total letters of credit 3,629,000 3,629,000 6,675,000
Commitments to Extend Credit to Borrowers [Member] | Variable [Member]      
Company's contractual commitments due to letters of credit      
Total letters of credit 28,881,000 28,881,000 29,354,000
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 18,486,000 18,486,000 18,879,000
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 2,116,000 2,116,000 3,514,000
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 16,370,000 16,370,000 15,365,000
Commitments to Extend Credit to Borrowers [Member] | Performance Guarantee [Member]      
Company's contractual commitments due to letters of credit      
Total letters of credit 14,024,000 14,024,000 17,150,000
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 1,513,000 1,513,000 3,161,000
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 12,511,000 12,511,000 13,989,000
Commitments to Extend Credit Nonborrowers [Member] | Performance Guarantee [Member]      
Company's contractual commitments due to letters of credit      
Total letters of credit 67,000 67,000 67,000
Commitments to Extend Credit Nonborrowers [Member] | Performance Guarantee [Member] | Variable [Member]      
Company's contractual commitments due to letters of credit      
Total letters of credit 67,000 67,000 67,000
Unused lines of Credit [Member]      
Company's contractual commitments due to letters of credit      
Loan commitments 905,347,000 905,347,000 999,325,000
Unused lines of Credit [Member] | Fixed [Member]      
Company's contractual commitments due to letters of credit      
Loan commitments 139,654,000 139,654,000 139,070,000
Unused lines of Credit [Member] | Variable [Member]      
Company's contractual commitments due to letters of credit      
Loan commitments $ 765,693,000 $ 765,693,000 $ 860,255,000