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Borrowing Arrangements - Components (Details) - Letter of Credit - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Unsecured Credit Lines    
Line of Credit Facility [Line Items]    
Total credit limit $ 110,000 $ 110,000
Balance outstanding 0 0
Federal Home Loan Bank Borrowings    
Line of Credit Facility [Line Items]    
Total credit limit 738,413 738,556
Balance outstanding 86,000 133,442
Collateral pledged 1,701,649 1,236,732
Fair value of collateral 1,319,460 1,083,041
Federal Reserve Bank    
Line of Credit Facility [Line Items]    
Balance outstanding 0 0
Federal Reserve Bank | Federal Reserve Bank Advances    
Line of Credit Facility [Line Items]    
Total credit limit 3,539 3,669
Collateral pledged 4,162 4,406
Fair value of collateral $ 3,680 $ 3,828