Securitizations and Variable Interest Entities - Unconsolidated VIEs with Significant Continuing Involvement (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Assets	$ 6,775,074	$ 4,900,319
Investment Fund
Variable Interest Entity [Line Items]
Assets	625,017	1,386,279
Unconsolidated VIEs
Variable Interest Entity [Line Items]
Assets	33,796	75,333
Carrying value	33,796	75,333
Total exposure	33,796	75,333
Securities Available for Sale | Unconsolidated VIEs
Variable Interest Entity [Line Items]
Carrying value	22,445	58,177
Total exposure	22,445	58,177
Other Assets | Unconsolidated VIEs
Variable Interest Entity [Line Items]
Carrying value	11,351	17,156
Total exposure	$ 11,351	$ 17,156