v3.26.1
Borrowed Funds (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Debt Instrument [Line Items]      
Other long-term debt $ 550,000   $ 550,000
Other short-term borrowings 1,930,000   1,560,000
Available for sale debt securities, at fair value 3,240,067   3,164,756
Interest expense, borrowings 21,300 $ 18,300  
Amortization related to purchase accounting on FHLB advances 316 $ 552  
Asset Pledged as Collateral | Securities Sold under Agreements to Repurchase      
Debt Instrument [Line Items]      
Available for sale debt securities, at fair value $ 2,250,000   $ 2,410,000