Segment Reporting Operating Profit and Loss by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021
Segment Reporting Information [Line Items]
Interest income	$ 370,172	$ 282,218	[1]	$ 175,505
Interest expense	(262,451)	(141,777)	[1]	(44,030)
Noninterest Income	169,199	(80,447)	[1]	19,562
Operating Expenses	(187,710)	(84,965)	[1]	(65,441)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	89,210	(24,971)	[1]	85,596
Income tax expense (benefit)	457	(17,716)	[1]	3,144
Earnings (losses) from investments in unconsolidated entities	(855)	(63,614)	[1]	58,104
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	87,898	(70,869)	[1]	140,556
Net income (loss) attributable to non-controlling interests	3,814	(822)	[1]	7,093
Dividends on preferred stock	23,182	15,292	[1]	8,117
Net income (loss) attributable to common stockholders	60,902	(85,339)	[1]	125,346
Depreciation	1,095	330
Investment Portfolio Segment
Segment Reporting Information [Line Items]
Interest income	344,575	277,141		175,419
Interest expense	(223,814)	(124,308)		(38,990)
Noninterest Income	12,457	(118,797)		21,393
Operating Expenses	(16,187)	29,532		21,638
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	117,031	4,504		136,184
Income tax expense (benefit)	0	0		0
Earnings (losses) from investments in unconsolidated entities	(855)	(63,614)		58,104
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	116,176	(59,110)		194,288
Net income (loss) attributable to non-controlling interests	3,125	212		5,294
Dividends on preferred stock	0	0		0
Net income (loss) attributable to common stockholders	113,051	(59,322)		188,994
Depreciation	0	0
Longbridge Segment
Segment Reporting Information [Line Items]
Interest income	18,913	2,859
Interest expense	(25,822)	(4,628)
Noninterest Income	118,512	39,935
Operating Expenses	(101,908)	23,674
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	9,695	14,492
Income tax expense (benefit)	0	0
Earnings (losses) from investments in unconsolidated entities	0	0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	9,695	14,492
Net income (loss) attributable to non-controlling interests	(41)	32
Dividends on preferred stock	0	0
Net income (loss) attributable to common stockholders	9,736	14,460
Depreciation	1,095	330
Corporate and Other
Segment Reporting Information [Line Items]
Interest income	6,684	2,218		86
Interest expense	(12,815)	(12,841)		(5,040)
Noninterest Income	38,230	(1,585)		(1,831)
Operating Expenses	(69,615)	31,759		43,803
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest	(37,516)	(43,967)		(50,588)
Income tax expense (benefit)	457	(17,716)		3,144
Earnings (losses) from investments in unconsolidated entities	0	0		0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	(37,973)	(26,251)		(53,732)
Net income (loss) attributable to non-controlling interests	730	(1,066)		1,799
Dividends on preferred stock	23,182	15,292		8,117
Net income (loss) attributable to common stockholders	(61,885)	(40,477)		$ (63,648)
Depreciation	$ 0	$ 0

[1] Conformed to current period presentation.