Goodwill and Intangible Assets, Mortgage Servicing Rights Roll-Forward (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2022	Dec. 31, 2020
Mortgage servicing rights:
Servicing Asset at Amortized Cost				$ 54,862		$ 59,967
Cumulative effect of accounting methodology change					$ 2,296
Servicing Asset at Fair Value, Amount	$ 84,390	$ 84,390	$ 77,351	57,158
Servicing Asset at Fair Value, Additions		3,564	7,279	16,151
Servicing Asset at Fair Value, Disposals		(7,185)	(9,350)
Additions				16,151
Amortization				(19,436)
Servicing Asset at Amortized Cost, Before Valuation Adjustments				56,682
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation allowance at beginning of year			(1,820)	(18,006)
(Additions) recoveries, net				16,186
Valuation allowance at end of year				(1,820)
Fair value of mortgage servicing rights				57,259
Portfolio of residential mortgage loans serviced for others (“servicing portfolio”)	$ 7,364,492	$ 7,364,492	$ 6,711,820	$ 6,994,834
Mortgage servicing rights, net to servicing portfolio	1.15%	1.15%	1.15%	0.78%
Mortgage servicing rights expense (a)				$ 3,250
Servicing Asset at Fair Value, Changes in Fair Value Resulting from Changes in Valuation Inputs or Changes in Assumptions		$ 8,881	$ 5,715
Servicing Asset at Fair Value, Other Changes in Fair Value		1,778	16,549
Loans transferred into held for sale from portfolio, net		$ 1,058,305	$ 18	$ 6,010
Residential mortgage
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Loans transferred into held for sale from portfolio, net	$ 969,000
Proceeds from Sale, Loan, Held-for-Sale	$ 844,000