Consolidated Securitization Vehicles and Other Variable Interest Entities - Income, OTTI and Expense Amounts Related to Consolidated VIEs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Variable Interest Entity [Line Items]
Net interest income	$ 66,451	$ 63,398	$ 198,853	$ 198,712
Net increase (decrease) in provision for credit losses			5,389	9,041
Servicing fees	7,334	8,139	22,470	24,965
Variable Interest Entities, Primary Beneficiary
Variable Interest Entity [Line Items]
Interest income, Assets of consolidated VIEs	146,007	153,710	436,950	443,286
Interest expense, Non-recourse liabilities of VIEs	71,668	75,902	214,483	208,678
Net interest income	74,339	77,808	222,467	234,608
Net increase (decrease) in provision for credit losses	(975)	(1,560)	1,760	(3,519)
Servicing fees	$ 6,533	$ 7,199	$ 19,965	$ 21,403