Asset-Backed Securities Issued - Accrued Interest Payable (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Total Accrued Interest Payable on ABS Issued	$ 60,925	$ 52,755
Asset-backed securities issued
Debt Instrument [Line Items]
Total Accrued Interest Payable on ABS Issued	37,939	33,516
Asset-backed securities issued | Legacy Sequoia
Debt Instrument [Line Items]
Total Accrued Interest Payable on ABS Issued		303
Asset-backed securities issued | Sequoia
Debt Instrument [Line Items]
Total Accrued Interest Payable on ABS Issued		15,990
Asset-backed securities issued | CAFL
Debt Instrument [Line Items]
Total Accrued Interest Payable on ABS Issued	$ 10,653	11,537
Asset-backed securities issued | Freddie Mac SLST
Debt Instrument [Line Items]
Total Accrued Interest Payable on ABS Issued		4,496
Asset-backed securities issued | Freddie Mac K-Series
Debt Instrument [Line Items]
Total Accrued Interest Payable on ABS Issued		$ 1,190