Goodwill and Other Intangible Assets, Mortgage Servicing Rights Roll-Forward (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Summary Of Changes In Balance Of Mortgage Servicing Rights Asset And Mortgage Servicing Rights Valuation Allowance [Abstract]
Servicing Asset at Amortized Cost			$ 56,682
Cumulative effect of accounting methodology change			2,296
Servicing Asset at Fair Value, Amount	$ 67,015		57,158
Servicing Asset at Fair Value, Additions	3,042	$ 3,348
Servicing Asset at Fair Value, Disposals	(2,637)
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions	2,345
Servicing Asset at Fair Value, Other Changes in Fair Value	7,106
Mortgage servicing rights
Mortgage servicing rights at beginning of period	56,682	59,967	59,967
Additions			16,151
Amortization			(19,436)
Mortgage servicing rights at end of period			56,682
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation allowance at beginning of period	(1,820)	$ (18,006)	(18,006)
(Additions) recoveries, net			16,186
Valuation allowance at end of period			(1,820)
Mortgage servicing rights, net(a)	67,015		54,862
Fair value of mortgage servicing rights			57,259
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$ 6,972,242		$ 6,994,834
Mortgage servicing rights, net to servicing portfolio	0.96%		0.78%
Mortgage servicing rights expense(a)			$ 3,250