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Loans and Investments - Schedule of Investment Portfolio and Concentration of Credit Risk (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026 USD ($) loan	Dec. 31, 2025 USD ($) loan	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Loans and Investments
Loans and investments, gross	$ 11,997,293	$ 12,113,107
Allowance for credit losses	(131,223)	(145,971)	$ (240,937)	$ (238,967)
Unearned revenue	(30,689)	(32,888)
Loans and investments, net	$ 11,835,381	$ 11,934,248
Percent of Total	100.00%	100.00%
Loan Count | loan	545	632
Wtd. Avg. Pay Rate (as a percent)	6.49%	6.49%
Wtd. Avg. Remaining Months to Maturity	15 months 21 days	14 months 21 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	2.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	77.00%
Weighted average remaining months to maturity including extension options	20 months 24 days	19 months 27 days
Exit fee receivable	$ 40,600	$ 43,000
Single-Family Rental
Loans and Investments
Allowance for credit losses	(7,910)	(8,817)	$ (6,524)	$ (7,524)
Bridge loans
Loans and Investments
Loans and investments, gross	$ 11,209,443	$ 11,371,758
Percent of Total	93.00%	94.00%
Loan Count | loan	439	524
Wtd. Avg. Pay Rate (as a percent)	6.37%	6.39%
Wtd. Avg. Remaining Months to Maturity	14 months 3 days	12 months 27 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	0.00%	0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	77.00%	77.00%
Bridge loans | Single-Family Rental
Loans and Investments
Number of loans under the loan portfolio | loan	224	298
Total loan commitment	$ 4,620,000	$ 4,730,000
Mezzanine loans
Loans and Investments
Loans and investments, gross	$ 295,843	$ 290,212
Percent of Total	3.00%	2.00%
Loan Count | loan	62	65
Wtd. Avg. Pay Rate (as a percent)	8.04%	7.84%
Wtd. Avg. Remaining Months to Maturity	48 months 18 days	52 months 9 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	58.00%	59.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	79.00%	78.00%
Construction - multifamily
Loans and Investments
Loans and investments, gross	$ 289,889	$ 249,019
Percent of Total	2.00%	2.00%
Loan Count | loan	10	9
Wtd. Avg. Pay Rate (as a percent)	9.12%	9.13%
Wtd. Avg. Remaining Months to Maturity	22 months 18 days	24 months 18 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	0.00%	0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	62.00%	60.00%
Preferred equity investments
Loans and Investments
Loans and investments, gross	$ 202,118	$ 202,118
Percent of Total	2.00%	2.00%
Loan Count | loan	34	34
Wtd. Avg. Pay Rate (as a percent)	6.87%	6.87%
Wtd. Avg. Remaining Months to Maturity	43 months	46 months
Wtd. Avg. First Dollar LTV Ratio (as percent)	62.00%	62.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	81.00%	80.00%
SFR permanent loans | Single-Family Rental
Loans and Investments
Unpaid principal balance, funded	$ 3,270,000	$ 3,180,000

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