Fair Value - Schedule of Changes in Level 3 Fair Value (Details) - Level 3 - Recurring - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 17,700	$ 0
Purchases, originations, drawdowns and contributions	0	0
Transfer out of equity to liability		81,400
Change in accrued interest and capitalization of paid-in-kind interest		0
Paydowns	0	0
Transfer of warehoused loans to sponsored fund		0
Consolidation of sponsored funds	0	0
Business combination	0
Change in consolidated fund's share of equity investment	0
Unrealized gain (loss) in earnings, net	21,500	(63,700)
Deconsolidation of sponsored fund	0
Ending balance	39,200	17,700
Net unrealized gains (losses) in earnings on instruments held, liability	21,500	(63,700)
InfraBridge contingent consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	0	0
Purchases, originations, drawdowns and contributions	0	0
Transfer out of equity to liability		0
Change in accrued interest and capitalization of paid-in-kind interest		0
Paydowns	0	0
Transfer of warehoused loans to sponsored fund		0
Consolidation of sponsored funds	0	0
Business combination	10,874
Change in consolidated fund's share of equity investment	0
Unrealized gain (loss) in earnings, net	464	0
Deconsolidation of sponsored fund	0
Ending balance	11,338	0
Net unrealized gains (losses) in earnings on instruments held, liability	464	0
AFS Debt Securities
Level 3 Assets
Beginnning balance	50,927	0
Purchases, originations, drawdowns and contributions	0	50,927
Transfer out of equity to liability		0
Change in accrued interest and capitalization of paid-in-kind interest		0
Paydowns	0	0
Transfer of warehoused loans to sponsored fund		0
Consolidation of sponsored fund	0	0
Business combination	0
Change in consolidated fund's share of equity investment	0
Unrealized gain (loss) in earnings, net	0	0
Deconsolidation of sponsored fund	0
Ending balance	50,927	50,927
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net unrealized gains (losses) in earnings on instruments held, asset	0	0
Loans Receivable
Level 3 Assets
Beginnning balance	133,307	78,607
Purchases, originations, drawdowns and contributions	0	370,496
Transfer out of equity to liability		0
Change in accrued interest and capitalization of paid-in-kind interest		5,814
Paydowns	0	(159,501)
Transfer of warehoused loans to sponsored fund		(123,312)
Consolidation of sponsored fund	0	0
Business combination	0
Change in consolidated fund's share of equity investment	0
Unrealized gain (loss) in earnings, net	(133,307)	(38,797)
Deconsolidation of sponsored fund	0
Ending balance	0	133,307
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net unrealized gains (losses) in earnings on instruments held, asset	(133,307)	(28,706)
Equity Method Investments
Level 3 Assets
Beginnning balance	0	0
Purchases, originations, drawdowns and contributions	20,000	0
Transfer out of equity to liability		0
Change in accrued interest and capitalization of paid-in-kind interest		0
Paydowns	0	0
Transfer of warehoused loans to sponsored fund		0
Consolidation of sponsored fund	0	0
Business combination	0
Change in consolidated fund's share of equity investment	0
Unrealized gain (loss) in earnings, net	(13,300)	0
Deconsolidation of sponsored fund	0
Ending balance	6,700	0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net unrealized gains (losses) in earnings on instruments held, asset	(13,300)	0
Equity Investment of Consolidated Fund
Level 3 Assets
Beginnning balance	46,770	0
Purchases, originations, drawdowns and contributions	85,486	35,566
Transfer out of equity to liability		0
Change in accrued interest and capitalization of paid-in-kind interest		0
Paydowns	(8,109)	0
Transfer of warehoused loans to sponsored fund		0
Consolidation of sponsored fund	393,614	10,536
Business combination	0
Change in consolidated fund's share of equity investment	1,842
Unrealized gain (loss) in earnings, net	2,216	668
Deconsolidation of sponsored fund	(105,205)
Ending balance	416,614	46,770
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net unrealized gains (losses) in earnings on instruments held, asset	$ 0	$ 668