Short and Long-Term Funding, FHLB Advances (Components of Short-term and Long-term Funding) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Short-term Funding [Abstract]
Federal Funds Purchased	$ 306,040	$ 220,160
Securities Sold under Agreements to Repurchase	110,988	106,620
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Total	417,028	326,780
Bank Term Funding Program Funding	500,000	0
Short-Term Debt, Total	917,028	326,780
Debt Instrument [Line Items]
Senior Notes	300,000	0
Subordinated Debt	550,000	550,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(8,807)	(7,748)
Finance Lease, Liability	317	383
Long-term Debt	844,342	541,269
TotalShortTermLongTermExcludingFHLB	1,761,370	868,049
Advance from Federal Home Loan Bank [Abstract]
Advance from Federal Home Loan Bank	705,000	740,000
Long-Term Federal Home Loan Bank Advances	1,211,835	1,209,907
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	1,913,294	1,940,194
Debt, Long-Term and Short-Term, Combined Amount	3,674,663	2,808,243
Fair Value Hedging [Member]
Debt Instrument [Line Items]
Subordinated Debt	2,832	(1,366)
Advance from Federal Home Loan Bank [Abstract]
Advance from Federal Home Loan Bank	$ (3,541)	$ (9,713)