Short and Long-Term Funding, FHLB Advances (Components of Short-term and Long-term Funding) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Short-term Funding [Abstract]
Federal funds purchased	$ 409,180	$ 120
Securities sold under agreements to repurchase	273,659	319,412
Federal funds purchased and securities sold under agreements to repurchase	682,839	319,532
Commercial paper	22,781	34,730
Total short-term funding	705,620	354,262
Long-Term Funding
Corporation subordinated notes, at par, due 2025	250,000	250,000
Other Long-term Debt and Capitalized Costs	(691)	(839)
Finance lease liability	511	163
Long-term Debt	249,820	249,324
TotalShortTermLongTermExcludingFHLB	955,440	603,587
FHLB Advances
Short-term FHLB advances	2,045,000	0
Long-term FHLB advances	1,213,039	1,621,047
FHLB advances	3,258,039	1,621,047
Total short and long-term funding	$ 4,213,479	$ 2,224,633