Fair Value of Assets and Liabilities - Sensitivity Analysis of Debt Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Sensitivity Analysis of Debt Securities Available-for-Sale [Line Items]
Total securities available for sale	$ 523,579	$ 345,702
Other asset-backed securities related to Structured Program transactions
Sensitivity Analysis of Debt Securities Available-for-Sale [Line Items]
Total securities available for sale	16,980
Discount rates
100 basis point increase	(193)
200 basis point increase	(388)
Expected loss rates
10% increase	(390)
20% increase	(798)
Expected prepayment rates
10% increase	(216)
20% increase	$ (496)
Other asset-backed securities related to Structured Program transactions | Weighted- Average
Sensitivity Analysis of Debt Securities Available-for-Sale [Line Items]
Expected weighted-average life (in years)	1 year 7 months 6 days