Fair Value Measurements - Fair Value of Servicing Assets to Adverse Changes in Key Assumptions (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing assets	$ 77,680	$ 84,308
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing assets	77,680	84,308
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing assets	77,680	84,308	$ 67,726
Fair Value, Measurements, Recurring | Level 3 | Servicing Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing assets	$ 77,680	$ 84,308
Expected remaining weighted-average life (in years)	1 year 2 months 12 days	1 year 2 months 12 days
Discount rates, impact of 100 basis point increase	$ (675)	$ (726)
Discount rates, impact of 200 basis point increase	(1,349)	(1,451)
Cumulative credit loss on rates on underlying loans, 10% adverse change	(878)	(1,037)
Cumulative credit loss on rates on underlying loans, 20% adverse change	(1,756)	(2,074)
Cumulative prepayment rates, 10% adverse change	(1,550)	(1,994)
Cumulative prepayment rates, 20% adverse change	$ (3,100)	$ (3,989)