Fair Value of Assets and Liabilities - Fair Value of Servicing Assets to Adverse Changes in Key Assumptions (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing assets	$ 86,518		$ 67,726
Level 3 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing assets	86,518		67,726
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing assets	86,518	$ 79,427	67,726	$ 63,573	$ 58,728	$ 56,347
Fair Value, Measurements, Recurring | Level 3 Inputs | Servicing Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing assets	86,518		67,726
Discount rates, impact of 100 basis point increase	(745)		(558)
Discount rates, impact of 200 basis point increase	(1,489)		(1,115)
Expected credit loss on rates on underlying loans, 10% adverse change	(837)		(693)
Expected credit loss on rates on underlying loans, 20% adverse change	(1,673)		(1,386)
Expected prepayment rates, 10% adverse change	(2,178)		(2,401)
Expected prepayment rates, 20% adverse change	$ (4,356)		$ (4,802)