Mortgage Servicing Rights - Data and Key Economic Assumptions Related to the Company's Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Data and Key Economic Assumptions Related to Mortgage Servicing Rights [Abstract]
Unpaid principal balance	$ 7,494,413	$ 8,728,629	$ 7,322,671
Weighted-average prepayment speed (CPR)	7.00%	10.56%	15.05%
Estimated impact of a 10% increase	$ (5,393)	$ (3,875)	$ (4,001)
Estimated impact of a 20% increase	$ (10,354)	$ (7,464)	$ (7,674)
Discount rate	10.30%	9.82%	9.86%
Estimated impact of a 100bp increase	$ (1,765)	$ (4,153)	$ (2,144)
Estimated impact of a 200bp increase	$ (3,957)	$ (8,119)	$ (4,144)
Weighted-average coupon interest rate	3.51%	3.29%	3.58%
Weighted-average servicing fee (basis points)	0.3244%	0.3037%	0.2994%
Weighted-average remaining maturity (in years)	8 years 3 months 29 days	6 years 8 months 8 days	5 years 1 month 20 days