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Borrowing Arrangements - Credit Lines, Balances Outstanding and Pledged Collateral (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Borrowing Arrangements    
Borrowings $ 133,442,000 $ 80,000,000
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 738,556,000 342,483,000
Borrowings 133,442,000 35,000,000
Fair value of collateral 1,083,041,000 500,972,000
Federal Home Loan Bank Borrowings | Asset Pledged as Collateral    
Borrowing Arrangements    
Collateral pledged 1,236,732,000 612,702,000
Federal Reserve Bank Term Loan Funding Program    
Borrowing Arrangements    
Credit limit 0 46,174,000
Borrowings 0 45,000,000
Fair value of collateral 0 47,603,000
Federal Reserve Bank Term Loan Funding Program | Asset Pledged as Collateral    
Borrowing Arrangements    
Collateral pledged 0 53,650,000
Federal Reserve Bank    
Borrowing Arrangements    
Credit limit 3,669,000 4,448,000
Borrowings 0 0
Fair value of collateral 3,828,000 4,374,000
Federal Reserve Bank | Asset Pledged as Collateral    
Borrowing Arrangements    
Collateral pledged $ 4,406,000 $ 4,894,000