Short and Long-Term Funding, FHLB Advances (Components of Short-term and Long-term Funding) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Short-term Funding [Abstract]
Federal funds purchased	$ 350	$ 344,170
Securities sold under agreements to repurchase	208,048	240,969
Federal funds purchased and securities sold under agreements to repurchase	208,398	585,139
Commercial paper	18,210	20,798
Total short-term funding	226,608	605,937
Long-term funding
Subordinated Debt	550,000	250,000
Other Long-term Debt and Capitalized Costs	(8,513)	(544)
Finance lease liability	448	469
Long-term Debt	544,103	248,071
TotalShortTermLongTermExcludingFHLB	770,711	854,007
Advance from Federal Home Loan Bank	3,785,000	3,125,000
Advance from Federal Home Loan Bank [Abstract]
Advance from Federal Home Loan Bank	3,785,000	3,125,000
Long-Term Federal Home Loan Bank Advances	1,208,745	1,209,170
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances	4,986,138	4,319,861
Debt, Long-Term and Short-Term, Combined Amount	5,756,849	5,173,869
Fair Value Hedging [Member]
Long-term funding
Subordinated Debt	2,168	(1,855)
Advance from Federal Home Loan Bank	(7,607)	(14,308)
Advance from Federal Home Loan Bank [Abstract]
Advance from Federal Home Loan Bank	$ (7,607)	$ (14,308)