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Short-Term Borrowings (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Short-Term Borrowings      
Short-term borrowings $ 0   $ 250,000
Federal Reserve Bank      
Short-Term Borrowings      
Borrowing capacity 3,400,000   3,000,000
FHLB      
Short-Term Borrowings      
Short-term borrowings     $ 250,000
Weighted-average interest rate (as a percent)   4.16% 4.16%
Borrowing capacity 3,000,000   $ 2,800,000
Highest month-end balance 250,000 $ 500,000  
Average outstanding balance $ 235,348 $ 483,577  
Weighted-average interest rate paid (as a percent) 4.22% 4.78%