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Short Term Borrowings (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Short-Term Debt [Line Items]    
Short-term borrowings $ 1,360,451,000 $ 1,017,292,000
Securities sold under agreements to repurchase 660,100,000 546,900,000
Federal funds purchased 300,000 70,400,000
FHLB Borrowings [Member]    
Short-Term Debt [Line Items]    
Short-term borrowings $ 700,000 $ 400,000,000
Short-term borrowings, weighted average interest rate 3.83%  
Short-term borrowings, maturity date Aug. 31, 2026 Jan. 02, 2026
Debt Instrument, Interest Rate, Stated Percentage   3.62%