Short and Long-Term Funding, FHLB Advances (Components of Short-term and Long-term Funding) (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Short-term Funding [Abstract]
Federal funds purchased	$ 270,015	$ 220,160
Securities sold under agreements to repurchase	89,524	106,620
Federal funds purchased and securities sold under agreements to repurchase	359,539	326,780
Bank Term Funding Program Funding	500,000	0
Total short-term funding	859,539	326,780
Long-term funding
Subordinated Debt	550,000	550,000
Other Long-term Debt and Capitalized Costs	(7,189)	(7,748)
Finance lease liability	339	383
Long-term Debt	536,113	541,269
TotalShortTermLongTermExcludingFHLB	1,395,652	868,049
Advance from Federal Home Loan Bank [Abstract]
Advance from Federal Home Loan Bank	1,475,000	740,000
Long-Term Federal Home Loan Bank Advances	1,211,867	1,209,907
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	2,673,046	1,940,194
Debt, Long-Term and Short-Term, Combined Amount	4,068,699	2,808,243
Fair Value Hedging [Member]
Long-term funding
Subordinated Debt	(7,037)	(1,366)
Advance from Federal Home Loan Bank [Abstract]
Advance from Federal Home Loan Bank	$ (13,820)	$ (9,713)