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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%

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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Amount of short term borrowing where a bank borrows, at the federal funds rate, from another bank.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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