Short-Term Borrowings (Narrative) (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2024 USD ($) Item	Dec. 31, 2023 USD ($) Item
Short-Term Debt [Line Items]
Securities sold under agreements to repurchase	$ 765,700	$ 454,500
Short-term borrowings	1,265,944	1,154,829
FHLB Borrowings [Member]
Short-Term Debt [Line Items]
Short-term borrowings	$ 300,000	$ 700,000
Short-term borrowings, weighted average interest rate	4.97%	5.58%
Short-term borrowings, maturity date	Oct. 01, 2024	Jan. 02, 2024
FHLB Borrowings [Member] | FHLB Borrowings, Redemption Period One [Member] | Fixed-rate Whole Loan Advances and Term Notes [Member]
Short-Term Debt [Line Items]
Number of fixed rate short-term borrowings | Item	2	1