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Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk - Commitments (Details) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Company's contractual commitments due to letters of credit    
Total letters of credit $ 34,460,000 $ 27,336,000
Allowance for credit loss on unfunded commitments 2,300,000  
Increase In allowance for credit loss on unfunded commitments 430,000 1,900,000
Fixed    
Company's contractual commitments due to letters of credit    
Total letters of credit 749,000 740,000
Variable    
Company's contractual commitments due to letters of credit    
Total letters of credit 33,711,000 26,596,000
Commitments to Extend Credit to Borrowers    
Company's contractual commitments due to letters of credit    
Total letters of credit 34,460,000 27,269,000
Commitments to Extend Credit to Borrowers | Fixed    
Company's contractual commitments due to letters of credit    
Total letters of credit 749,000 740,000
Commitments to Extend Credit to Borrowers | Variable    
Company's contractual commitments due to letters of credit    
Total letters of credit 33,711,000 26,529,000
Commitments to Extend Credit to Borrowers | Financial standby    
Company's contractual commitments due to letters of credit    
Total letters of credit 26,495,000 16,510,000
Commitments to Extend Credit to Borrowers | Financial standby | Fixed    
Company's contractual commitments due to letters of credit    
Total letters of credit 202,000 188,000
Commitments to Extend Credit to Borrowers | Financial standby | Variable    
Company's contractual commitments due to letters of credit    
Total letters of credit 26,293,000 16,322,000
Commitments to Extend Credit to Borrowers | Performance standby    
Company's contractual commitments due to letters of credit    
Total letters of credit 7,965,000 10,759,000
Commitments to Extend Credit to Borrowers | Performance standby | Fixed    
Company's contractual commitments due to letters of credit    
Total letters of credit 547,000 552,000
Commitments to Extend Credit to Borrowers | Performance standby | Variable    
Company's contractual commitments due to letters of credit    
Total letters of credit 7,418,000 10,207,000
Commitments to Extend Credit Nonborrowers | Performance standby    
Company's contractual commitments due to letters of credit    
Total letters of credit   67,000
Commitments to Extend Credit Nonborrowers | Performance standby | Variable    
Company's contractual commitments due to letters of credit    
Total letters of credit   67,000
Unused lines of Credit    
Company's contractual commitments due to letters of credit    
Unused loan commitments 808,669,000 779,815,000
Unused lines of Credit | Fixed    
Company's contractual commitments due to letters of credit    
Unused loan commitments 170,894,000 163,282,000
Unused lines of Credit | Variable    
Company's contractual commitments due to letters of credit    
Unused loan commitments $ 637,775,000 $ 616,533,000