Short and Long-Term Funding, Composition (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Short-Term Debt [Abstract]
Federal Funds Purchased	$ 473,905	$ 260,070
Securities Sold under Agreements to Repurchase	55,371	47,794
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Total	529,276	307,864
Debt Instrument [Line Items]
Senior Notes	300,000	300,000
Subordinated Debt	300,000	300,000
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	(6,895)	(7,484)
Long-term Debt	591,080	594,276
TotalShortTermLongTermExcludingFHLB	1,120,356	902,140
Federal Funds Purchased	473,905	260,070
Securities Sold under Agreements to Repurchase	55,371	47,794
Federal Funds Purchased and Securities Sold under Agreements to Repurchase	529,276	307,864
Advance from Federal Home Loan Bank	4,315,000	2,855,250
Long-Term Federal Home Loan Bank Advances	263,115	414,122
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	4,574,681	3,268,094
Debt, Long-Term and Short-Term, Combined Amount	5,695,037	4,170,234
Short-Term Debt	529,276	307,864
Advance from Federal Home Loan Bank [Abstract]
Advance from Federal Home Loan Bank	4,315,000	2,855,250
Long-Term Federal Home Loan Bank Advances	263,115	414,122
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	4,574,681	3,268,094
Debt, Long-Term and Short-Term, Combined Amount	5,695,037	4,170,234
Fair Value Hedging [Member]
Debt Instrument [Line Items]
Subordinated Debt	(2,025)	1,760
Advance from Federal Home Loan Bank	(3,434)	(1,278)
Advance from Federal Home Loan Bank [Abstract]
Advance from Federal Home Loan Bank	$ (3,434)	$ (1,278)