Short and Long-term Funding, Composition (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Short-Term Debt [Abstract]
Federal Funds Purchased	$ 220,160	$ 344,170
Securities Sold under Agreements to Repurchase	106,620	240,969
Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Total	326,780	585,139
Commercial Paper	0	20,798
Short-Term Debt, Total	326,780	605,937
Debt Instrument [Line Items]
Subordinated Debt	550,000	250,000
Other Long-term Debt and Capitalized Costs	(7,748)	(544)
Finance Lease, Liability	383	469
Other Long-term Debt	541,269	248,071
TotalShortTermLongTermExcludingFHLB	868,049	854,007
Advance from Federal Home Loan Bank	740,000	3,125,000
Advances from Federal Home Loan Banks [Abstract]
Advance from Federal Home Loan Bank	740,000	3,125,000
Long-Term Federal Home Loan Bank Advances	1,209,907	1,209,170
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	1,940,194	4,319,861
Debt, Long-Term and Short-Term, Combined Amount, Total	2,808,243	5,173,869
Fair Value Hedging
Debt Instrument [Line Items]
Subordinated Debt	(1,366)	(1,855)
Advance from Federal Home Loan Bank	(9,713)	(14,308)
Advances from Federal Home Loan Banks [Abstract]
Advance from Federal Home Loan Bank	$ (9,713)	$ (14,308)