Investments in Unconsolidated Entities Schedule of Ownership of Investments in Unconsolidated Entities (Details)	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Longbridge Financial LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		49.60%	49.60%
LendSure Mortgage Corp [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		49.90%	49.90%
LendSure Mortgage Corp [Member] | Nonvoting Common Stock [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		13.80%	13.80%
Jepson Holdings Limited
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		7.20%	19.60%
Elizon DB 2015-1 LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		6.30%	3.40%
Effective Ownership Percentage	52.80%		47.50%
Other Equity Method Investments [Member] | Nonvoting Common Stock [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		16.40%	16.40%
Elizon NM CRE 2020-1 LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		33.90%	20.50%
Effective Ownership Percentage		29.30%	31.00%
Elizon CH CRE 2020-1 LLC
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		35.50%	30.50%
Effective Ownership Percentage		57.40%	44.80%
Co-investments with Ellington affiliate(s) - Other
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		0.00%	16.80%
Equity investments in securitization-related risk retention vehicles
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage			56.30%
Minimum | Other Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		8.20%	8.00%
Minimum | Loan Originator - Other
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		31.50%	31.50%
Minimum | Equity investments in securitization-related risk retention vehicles
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		24.60%
Maximum | Other Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		79.00%	79.00%
Maximum | Loan Originator - Other
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		80.00%	80.00%
Maximum | Equity investments in securitization-related risk retention vehicles
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		56.30%