Segment Reporting Operating Profit and Loss by Segment (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Interest income	$ 88,092		$ 62,722		$ 175,266	$ 113,796
Interest expense	(63,433)		(26,024)		(123,050)	(40,041)
Noninterest Income	34,663		(69,607)		86,338	(95,049)
Operating Expenses	42,632		13,102		80,534	32,669
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	16,690		(46,011)		58,020	(53,963)
Income Tax Expense (Benefit)	83		(7,825)		104	(14,785)
Earnings (losses) from investments in unconsolidated entities	(5,868)		(23,265)		(2,424)	(28,771)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	10,739	$ 44,753	(61,451)	$ (6,498)	55,492	(67,949)
Net income (loss) attributable to non-controlling interests	1,861		(391)		2,581	(811)
Dividends on preferred stock	5,980		3,821		11,097	7,645
Net income (loss) attributable to common stockholders	2,898		(64,881)		41,814	(74,783)
Depreciation	352				710
Investment Portfolio Segment
Segment Reporting Information [Line Items]
Interest income	83,118		62,387		165,487	113,442
Interest expense	(54,207)		(21,620)		(106,343)	(34,299)
Noninterest Income	13,352		(72,547)		24,281	(94,318)
Operating Expenses	3,865		5,315		7,369	13,067
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	38,398		(37,095)		76,056	(28,242)
Income Tax Expense (Benefit)	0		0		0	0
Earnings (losses) from investments in unconsolidated entities	(5,868)		(23,265)		(2,424)	(28,771)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	32,530		(60,360)		73,632	(57,013)
Net income (loss) attributable to non-controlling interests	1,847		429		2,085	131
Dividends on preferred stock	0		0		0	0
Net income (loss) attributable to common stockholders	30,683		(60,789)		71,547	(57,144)
Depreciation	0				0
Longbridge Segment
Segment Reporting Information [Line Items]
Interest income	3,779				6,672
Interest expense	(6,117)				(10,463)
Noninterest Income	30,630				64,028
Operating Expenses	25,816				51,263
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	2,476				8,974
Income Tax Expense (Benefit)	0				0
Earnings (losses) from investments in unconsolidated entities	0				0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	2,476				8,974
Net income (loss) attributable to non-controlling interests	(25)				(23)
Dividends on preferred stock	0				0
Net income (loss) attributable to common stockholders	2,501				8,997
Depreciation	352				710
Corporate and Other
Segment Reporting Information [Line Items]
Interest income	1,195		335		3,107	354
Interest expense	(3,109)		(4,404)		(6,244)	(5,742)
Noninterest Income	(9,319)		2,940		(1,971)	(731)
Operating Expenses	12,951		7,787		21,902	19,602
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(24,184)		(8,916)		(27,010)	(25,721)
Income Tax Expense (Benefit)	83		(7,825)		104	(14,785)
Earnings (losses) from investments in unconsolidated entities	0		0		0	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(24,267)		(1,091)		(27,114)	(10,936)
Net income (loss) attributable to non-controlling interests	39		(820)		519	(942)
Dividends on preferred stock	5,980		3,821		11,097	7,645
Net income (loss) attributable to common stockholders	(30,286)		$ (4,092)		(38,730)	$ (17,639)
Depreciation	$ 0				$ 0