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Borrowing Arrangements - Credit Lines, Balances Outstanding and Pledged Collateral (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Borrowing Arrangements    
Borrowings $ 134,377 $ 133,442
Unsecured Credit Lines    
Borrowing Arrangements    
Credit limit 110,000 110,000
Borrowings 0 0
Federal Home Loan Bank Borrowings    
Borrowing Arrangements    
Credit limit 751,261 738,556
Borrowings 134,377 133,442
Fair value of collateral 1,299,838 1,083,041
Federal Home Loan Bank Borrowings | Asset Pledged as Collateral    
Borrowing Arrangements    
Collateral pledged 1,682,393 1,236,732
Federal Reserve Bank    
Borrowing Arrangements    
Credit limit 3,632 3,669
Borrowings 0 0
Fair value of collateral 3,770 3,828
Federal Reserve Bank | Asset Pledged as Collateral    
Borrowing Arrangements    
Collateral pledged $ 4,270 $ 4,406