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, 2023	Dec. 31, 2022	Dec. 31, 2021
Data and Key Economic Assumptions Related to Mortgage Servicing Rights [Abstract]
Unpaid principal balance	$ 7,826,182	$ 7,494,413	$ 8,728,629
Weighted-average prepayment speed (CPR)	8.77%	7.00%	10.56%
Estimated impact of a 10% increase	$ (2,653)	$ (5,393)	$ (3,875)
Estimated impact of a 20% increase	$ (5,457)	$ (10,354)	$ (7,464)
Discount rate	10.85%	10.30%	9.82%
Estimated impact of a 100bp increase	$ (4,753)	$ (1,765)	$ (4,153)
Estimated impact of a 200bp increase	$ (9,149)	$ (3,957)	$ (8,119)
Weighted-average coupon interest rate	3.88%	3.51%	3.29%
Weighted-average servicing fee (basis points)	0.3324%	0.3244%	0.3037%
Weighted-average remaining maturity (in years)	7 years 6 months	8 years 3 months 29 days	6 years 8 months 8 days