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Borrowing Arrangements - Credit Lines, Balances Outstanding and Pledged Collateral (Details) - USD ($)
Dec. 31, 2025
Dec. 31, 2024
Borrowing Arrangements    
Borrowings $ 73,000,000 $ 133,442,000
Unsecured Credit Lines    
Borrowing Arrangements    
Credit limit 110,000,000 110,000,000
Borrowings 0 0
Federal Home Loan Bank Borrowings    
Borrowing Arrangements    
Credit limit 809,391,000 738,556,000
Borrowings 73,000,000 133,442,000
Fair value of collateral 1,230,691,000 1,083,041,000
Federal Home Loan Bank Borrowings | Asset Pledged as Collateral    
Borrowing Arrangements    
Collateral pledged 1,446,828,000 1,236,732,000
Federal Reserve Bank    
Borrowing Arrangements    
Credit limit 3,411,000 3,669,000
Borrowings 0 0
Fair value of collateral 3,536,000 3,828,000
Federal Reserve Bank | Asset Pledged as Collateral    
Borrowing Arrangements    
Collateral pledged $ 3,910,000 $ 4,406,000