Short and Long-term Funding, Composition (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Short-Term Debt [Abstract]
Federal Funds Purchased	$ 260,070	$ 370,325
Securities Sold under Agreements to Repurchase	47,794	100,044
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Total	307,864	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	(7,484)	(8,664)
Finance Lease, Liability	0	295
Other Long-term Debt	594,276	837,635
TotalShortTermLongTermExcludingFHLB	902,140	1,308,004
Federal Funds Purchased and Securities Sold under Agreements to Repurchase	307,864	470,369
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	3,268,094	1,853,807
Debt, Long-Term and Short-Term, Combined Amount	4,170,234	3,161,811
Advances from Federal Home Loan Banks [Abstract]
Advance from Federal Home Loan Bank	2,855,250	1,250,000
Long-Term Federal Home Loan Bank Advances	414,122	611,551
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	3,268,094	1,853,807
Debt, Long-Term and Short-Term, Combined Amount, Total	4,170,234	3,161,811
Fair Value Hedging
Debt Instrument [Line Items]
Subordinated Debt	1,760	(3,996)
Advances from Federal Home Loan Banks [Abstract]
Advance from Federal Home Loan Bank	$ (1,278)	$ (7,744)