Affiliates - Schedule of Net Income, Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
(Loss)/income from investments in affiliates	$ (63)	$ 163
Assets at Company share	1,685,879		$ 1,759,680
Liabilities at Company share	1,198,380		1,259,207
Gaea Real Estate Corp.
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	191	78
(Loss)/income from investments in affiliates	42	18
Assets at Company share	31,252		24,092
Liabilities at Company share	7,064		5,542
Gaea Real Estate Corp. | Assets
Schedule of Equity Method Investments [Line Items]
Assets and Liabilities at 100%	140,774		105,667
Gaea Real Estate Corp. | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and Liabilities at 100%	31,822		24,305
AS Ajax E LLC
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	19	54
(Loss)/income from investments in affiliates	3	9
Assets at Company share	535		583
Liabilities at Company share	0		0
AS Ajax E LLC | Assets
Schedule of Equity Method Investments [Line Items]
Assets and Liabilities at 100%	3,252		3,545
AS Ajax E LLC | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and Liabilities at 100%	1		2
Loan pool LLCs
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	(20)	(16)
(Loss)/income from investments in affiliates	(8)	(7)
Assets at Company share	897		900
Liabilities at Company share	1,641		1,635
Loan pool LLCs | Assets
Schedule of Equity Method Investments [Line Items]
Assets and Liabilities at 100%	2,234		2,242
Loan pool LLCs | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and Liabilities at 100%	4,073		4,060
Thetis Asset Management LLC
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	(206)	851
(Loss)/income from investments in affiliates	(41)	168
Assets at Company share	1,683		1,881
Liabilities at Company share	329		377
Thetis Asset Management LLC | Assets
Schedule of Equity Method Investments [Line Items]
Assets and Liabilities at 100%	8,499		9,498
Thetis Asset Management LLC | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and Liabilities at 100%	1,664		1,904
Great Ajax FS LLC
Schedule of Equity Method Investments [Line Items]
Net income/(loss) at 100%	(1,157)	(777)
(Loss)/income from investments in affiliates	(93)	$ (62)
Assets at Company share	5,985		5,308
Liabilities at Company share	4,552		3,783
Great Ajax FS LLC | Assets
Schedule of Equity Method Investments [Line Items]
Assets and Liabilities at 100%	74,809		66,355
Great Ajax FS LLC | Liabilities
Schedule of Equity Method Investments [Line Items]
Assets and Liabilities at 100%	$ 56,906		$ 47,293