Short and Long-Term Funding, FHLB Advances (Components of Short-term and Long-term Funding) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Short-term Funding [Abstract]
Federal funds purchased	$ 100,060	$ 120
Securities sold under agreements to repurchase	268,708	319,412
Federal funds purchased and securities sold under agreements to repurchase	368,768	319,532
Commercial paper	30,593	34,730
Total short-term funding	399,361	354,262
Long-Term Funding
Corporation subordinated notes, at par, due 2025	250,000	250,000
Other Long-term Debt and Capitalized Costs	(765)	(839)
Finance lease liability	562	163
Long-term Debt	249,797	249,324
TotalShortTermLongTermExcludingFHLB	649,158	603,587
FHLB Advances
Short-term FHLB advances	320,000	0
Long-term FHLB advances	1,217,948	1,621,047
FHLB advances	1,537,948	1,621,047
Total short and long-term funding	$ 2,187,106	$ 2,224,633