Segment Reporting Operating Profit and Loss by Segment (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Interest income		$ 115,471		$ 100,470		$ 231,384	$ 201,990
Interest expense		(72,128)		(66,874)		(144,784)	(137,338)
Noninterest Income		49,199		57,561		88,850	102,045
Operating Expenses		(57,066)		(42,985)		(109,050)	(86,640)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		35,476		48,172		66,400	80,057
Income tax expense (benefit)		1,475		142		1,379	202
Earnings (losses) from investments in unconsolidated entities		17,072		12,042		25,376	14,268
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		51,073	$ 39,324	60,072	$ 34,051	90,397	94,123
Net income (loss) attributable to non-controlling interests		1,114		900		1,754	1,382
Dividends on preferred stock		7,036		6,825		14,071	13,479
Net income (loss) attributable to common stockholders		42,923		52,347		74,572	79,262
Depreciation		292		572		595	842
Other investment related expenses - Servicing expense		(7,220)		(5,782)		(14,239)	(11,470)
Investment related expenses—Other		11,427		5,305		18,036	12,853
Management Fee Expense	[1]	(6,270)		(5,811)		(12,362)	(11,541)
Incentive Fee Expense		0		0		(4,533)	0
Salary and Wage, NonOfficer, Excluding Cost of Good and Service Sold		(21,332)		(16,353)		(38,274)	(30,996)
Segment Reporting, Other Segment Item, Amount		10,817		9,734		21,606	19,780
Investment Portfolio Segment
Segment Reporting Information [Line Items]
Interest income		89,669		88,790		183,016	180,193
Interest expense		(48,819)		(53,628)		(100,382)	(110,939)
Noninterest Income		7,017		27,584		19,409	37,610
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		40,361		57,434		89,461	98,409
Income tax expense (benefit)		0		0		0	0
Earnings (losses) from investments in unconsolidated entities		17,072		12,042		25,376	14,268
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		57,433		69,476		114,837	112,677
Net income (loss) attributable to non-controlling interests		602		382		918	567
Dividends on preferred stock		0		0		0	0
Net income (loss) attributable to common stockholders		56,831		69,094		113,919	112,110
Depreciation		0		0		0	0
Other investment related expenses - Servicing expense		(1,524)		(1,257)		(3,087)	(2,474)
Investment related expenses—Other		3,944		2,049		5,198	3,805
Management Fee Expense		0		0		0	0
Incentive Fee Expense						0
Salary and Wage, NonOfficer, Excluding Cost of Good and Service Sold		(2,038)		(2,006)		(4,297)	(2,176)
Segment Reporting, Other Segment Item, Amount		0		0		0	0
Longbridge Segment
Segment Reporting Information [Line Items]
Interest income		24,134		9,765		44,987	18,006
Interest expense		(19,338)		(8,615)		(35,951)	(17,172)
Noninterest Income		44,008		29,868		70,341	68,036
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		10,681		4,209		9,687	12,963
Income tax expense (benefit)		0		0		0	0
Earnings (losses) from investments in unconsolidated entities		0		0		0	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		10,681		4,209		9,687	12,963
Net income (loss) attributable to non-controlling interests		0		0		0	38
Dividends on preferred stock		0		0		0	0
Net income (loss) attributable to common stockholders		10,681		4,209		9,687	12,925
Depreciation		292		572		595	842
Other investment related expenses - Servicing expense		(5,696)		(4,525)		(11,152)	(8,996)
Investment related expenses—Other		7,483		3,256		12,838	9,048
Management Fee Expense		0		0		0	0
Incentive Fee Expense						0
Salary and Wage, NonOfficer, Excluding Cost of Good and Service Sold		(17,611)		(13,012)		(31,371)	(25,754)
Segment Reporting, Other Segment Item, Amount		7,333		6,016		14,329	12,109
Corporate Segment and Other Operating Segment
Segment Reporting Information [Line Items]
Interest income		1,668		1,915		3,381	3,791
Interest expense		(3,971)		(4,631)		(8,451)	(9,227)
Noninterest Income		(1,826)		109		(900)	(3,601)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest		(15,566)		(13,471)		(32,748)	(31,315)
Income tax expense (benefit)		1,475		142		1,379	202
Earnings (losses) from investments in unconsolidated entities		0		0		0	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		(17,041)		(13,613)		(34,127)	(31,517)
Net income (loss) attributable to non-controlling interests		512		518		836	777
Dividends on preferred stock		7,036		6,825		14,071	13,479
Net income (loss) attributable to common stockholders		(24,589)		(20,956)		(49,034)	(45,773)
Depreciation		0		0		0	0
Other investment related expenses - Servicing expense		0		0		0	0
Investment related expenses—Other		0		0		0	0
Management Fee Expense		(6,270)		(5,811)		(12,362)	(11,541)
Incentive Fee Expense						(4,533)
Salary and Wage, NonOfficer, Excluding Cost of Good and Service Sold		(1,683)		(1,335)		(2,606)	(3,066)
Segment Reporting, Other Segment Item, Amount		$ 3,484		$ 3,718		$ 7,277	$ 7,671

[1] See Note 16 for further details on management fee rebates.