Fair Value, Company's Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Servicing Related Assets [Abstract]
Beginning Balance	[1]			$ 253,629
Purchases and sales [Abstract]
Proceeds from sale of MSRs				13,308	$ 0
Gain on sale of MSRs		$ (237)	$ 0	504	0
Changes in Fair Value due to [Abstract]
Ending Balance	[1]	226,782		226,782
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Servicing Related Assets [Abstract]
Beginning Balance		234,263	264,906	253,629	279,739
Purchases and sales [Abstract]
Purchases		0	0	0	5
Sales	[2]	0	0	(12,804)	0
Other changes	[3]	(14)	(10)	(7)	(170)
Purchases and sales		(14)	(10)	(12,811)	(165)
Changes in Fair Value due to [Abstract]
Changes in valuation inputs or assumptions used in valuation model		(3,624)	6,060	(1,586)	552
Other changes in fair value	[4]	$ (3,843)	$ (4,482)	$ (12,450)	$ (13,652)
Servicing Asset, Fair Value, Change in Fair Value, Other, Statement of Income or Comprehensive Income [Extensible Enumeration]		Unrealized Gain (Loss) On Investments In Servicing Related Assets	Unrealized Gain (Loss) On Investments In Servicing Related Assets	Unrealized Gain (Loss) On Investments In Servicing Related Assets	Unrealized Gain (Loss) On Investments In Servicing Related Assets
Unrealized gain (loss) included in Net Income		$ (7,467)	$ 1,578	$ (14,036)	$ (13,100)
Ending Balance		$ 226,782	$ 266,474	$ 226,782	$ 266,474

[1] See Note 9 regarding the estimation of fair value, which approximates carrying value for all pools.

[2] During the nine-month period ended September 30, 2024, the Company sold a portion of its MSRs to a third party for proceeds of $13.3 million and recognized a gain of $0.5 million on the sale.

[3] Represents purchase price adjustments, principally contractual prepayment protection, and changes due to the Company’s repurchase of the underlying collateral.

[4] Represents changes due to realization of expected cash flows and estimated MSR runoff.