Investment in Loans (Schedule of Commercial Mortgage Loans) (Details) (Details) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2025 USD ($) loan	Dec. 31, 2024 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance		$ 14,926,381	$ 13,657,446
Unamortized Premium (Discount)		(483,221)	(389,777)
Loans, at fair value(1)(2)	[1],[2]	$ 15,531,299	$ 13,999,572
Weighted Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Coupon		4.64%	4.77%
Weighted Average Yield		9.07%	6.58%
Weighted average life		5 years 3 months 3 days	5 years 11 months 26 days
Commercial mortgage loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance		$ 546,466	$ 370,658
Unamortized Premium (Discount)		(866)	(8,341)
Investments, at fair value, Cost		545,600	362,317
Gains		145	0
Losses		(71)	(11,802)
Loans, at fair value(1)(2)		545,674	$ 350,515
Number of mortgage loans in process of foreclosure			1
Mortgage Loans In Process Of Foreclosure, Unpaid Principal Balance			$ 15,500
Commercial mortgage loans | Non-performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance		61,500	56,500
Loans, at fair value(1)(2)		$ 60,700	$ 37,600
Number of loans | loan		8	4
Commercial mortgage loans | Weighted Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Coupon		10.05%	10.55%
Weighted Average Yield		9.92%	10.59%
Weighted average life		1 year 1 month 13 days	1 year 2 months 19 days
Non-accrual status [Member] | Commercial mortgage loans | Non-performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, at fair value(1)(2)		$ 60,700	$ 37,600

[1] Ellington Financial Inc.'s Condensed Consolidated Balance Sheets include assets and liabilities of variable interest entities it has consolidated. See Note 12 for additional details on Ellington Financial Inc.'s consolidated variable interest entities.

[2] Includes assets pledged as collateral to counterparties. See Note 14 for additional details on the Company's borrowings and related collateral.