Short and Long-Term Funding, Composition (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Short-Term Debt [Abstract]
Federal Funds Purchased	$ 225,385	$ 370,325
Securities Sold under Agreements to Repurchase	85,950	100,044
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Total	311,335	470,369
Debt Instrument [Line Items]
Senior Notes	300,000	300,000
Subordinated Debt	300,000	550,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(8,369)	(8,664)
Finance Lease, Liability	273	295
Long-term Debt	591,382	837,635
TotalShortTermLongTermExcludingFHLB	902,718	1,308,004
Advance from Federal Home Loan Bank [Abstract]
Advance from Federal Home Loan Bank	1,420,000	1,250,000
Long-Term Federal Home Loan Bank Advances	611,519	611,551
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	2,027,297	1,853,807
Debt, Long-Term and Short-Term, Combined Amount	2,930,015	3,161,811
Fair Value Hedging [Member]
Debt Instrument [Line Items]
Subordinated Debt	(521)	(3,996)
Advance from Federal Home Loan Bank [Abstract]
Advance from Federal Home Loan Bank	$ (4,222)	$ (7,744)