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Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk - Commitments (Details) - USD ($)
 3 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Company's contractual commitments due to letters of credit    
Total letters of credit $ 30,515,000 $ 31,112,000
Allowance for credit loss on unfunded commitments 2,500,000  
Decrease In allowance for credit loss on unfunded commitments 199,000  
Fixed    
Company's contractual commitments due to letters of credit    
Total letters of credit 791,000 735,000
Variable    
Company's contractual commitments due to letters of credit    
Total letters of credit 29,724,000 30,377,000
Commitments to Extend Credit to Borrowers    
Company's contractual commitments due to letters of credit    
Total letters of credit 30,448,000 31,045,000
Commitments to Extend Credit to Borrowers | Fixed    
Company's contractual commitments due to letters of credit    
Total letters of credit 791,000 735,000
Commitments to Extend Credit to Borrowers | Variable    
Company's contractual commitments due to letters of credit    
Total letters of credit 29,657,000 30,310,000
Commitments to Extend Credit to Borrowers | Financial Standby Letter of Credit    
Company's contractual commitments due to letters of credit    
Total letters of credit 17,419,000 16,794,000
Commitments to Extend Credit to Borrowers | Financial Standby Letter of Credit | Fixed    
Company's contractual commitments due to letters of credit    
Total letters of credit 229,000 173,000
Commitments to Extend Credit to Borrowers | Financial Standby Letter of Credit | Variable    
Company's contractual commitments due to letters of credit    
Total letters of credit 17,190,000 16,621,000
Commitments to Extend Credit to Borrowers | Performance Guarantee    
Company's contractual commitments due to letters of credit    
Total letters of credit 13,029,000 14,251,000
Commitments to Extend Credit to Borrowers | Performance Guarantee | Fixed    
Company's contractual commitments due to letters of credit    
Total letters of credit 562,000 562,000
Commitments to Extend Credit to Borrowers | Performance Guarantee | Variable    
Company's contractual commitments due to letters of credit    
Total letters of credit 12,467,000 13,689,000
Commitments to Extend Credit Nonborrowers | Performance Guarantee    
Company's contractual commitments due to letters of credit    
Total letters of credit 67,000 67,000
Commitments to Extend Credit Nonborrowers | Performance Guarantee | Variable    
Company's contractual commitments due to letters of credit    
Total letters of credit 67,000 67,000
Unused lines of Credit    
Company's contractual commitments due to letters of credit    
Loan commitments 793,945,000 835,265,000
Unused lines of Credit | Fixed    
Company's contractual commitments due to letters of credit    
Loan commitments 158,385,000 140,305,000
Unused lines of Credit | Variable    
Company's contractual commitments due to letters of credit    
Loan commitments $ 635,560,000 $ 694,960,000