Mortgage-Backed Securities - Gross Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gain Included in Accumulated Other Comprehensive Income	$ 141,849	$ 153,099
Gross Unrealized Gain Included in Cumulative Earnings	58,264	82,261
Total Gross Unrealized Gain	200,113	235,360
Gross Unrealized Loss Included in Accumulated Other Comprehensive Income	(4,112)	(6,804)
Gross Unrealized Loss Included in Cumulative Earnings	(113,091)	(101,845)
Total Gross Unrealized Loss	(117,203)	(108,649)
Non-Agency RMBS - Senior
Debt Securities, Available-for-sale [Line Items]
Total Gross Unrealized Gain	132,530	143,580
Total Gross Unrealized Loss	(3,536)	(3,409)
Non-Agency RMBS - Subordinated
Debt Securities, Available-for-sale [Line Items]
Total Gross Unrealized Gain	22,758	22,925
Total Gross Unrealized Loss	(9,160)	(11,663)
Non-Agency RMBS - Interest-only
Debt Securities, Available-for-sale [Line Items]
Total Gross Unrealized Gain	13,012	13,286
Total Gross Unrealized Loss	(82,291)	(80,786)
Pass-through
Debt Securities, Available-for-sale [Line Items]
Total Gross Unrealized Gain	29,845	54,015
Total Gross Unrealized Loss	(12,596)	(237)
Agency RMBS - CMO
Debt Securities, Available-for-sale [Line Items]
Total Gross Unrealized Gain	1,855	1,357
Total Gross Unrealized Loss	(173)	(133)
Agency RMBS - Interest-only
Debt Securities, Available-for-sale [Line Items]
Total Gross Unrealized Gain	3	65
Total Gross Unrealized Loss	(3,867)	(3,835)
Agency CMBS - Project loans
Debt Securities, Available-for-sale [Line Items]
Total Gross Unrealized Gain	0	0
Total Gross Unrealized Loss	(4,796)	(7,756)
Agency CMBS - Interest-only
Debt Securities, Available-for-sale [Line Items]
Total Gross Unrealized Gain	110	132
Total Gross Unrealized Loss	(784)	(830)
Residential Mortgage-Backed Securities \| Non-Agency RMBS - Senior
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gain Included in Accumulated Other Comprehensive Income	132,530	143,580
Gross Unrealized Gain Included in Cumulative Earnings	0	0
Total Gross Unrealized Gain	132,530	143,580
Gross Unrealized Loss Included in Accumulated Other Comprehensive Income	(3,536)	(3,409)
Gross Unrealized Loss Included in Cumulative Earnings	0	0
Total Gross Unrealized Loss	(3,536)	(3,409)
Residential Mortgage-Backed Securities \| Non-Agency RMBS - Subordinated
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gain Included in Accumulated Other Comprehensive Income	9,319	9,519
Gross Unrealized Gain Included in Cumulative Earnings	13,439	13,406
Total Gross Unrealized Gain	22,758	22,925
Gross Unrealized Loss Included in Accumulated Other Comprehensive Income	(576)	(3,395)
Gross Unrealized Loss Included in Cumulative Earnings	(8,584)	(8,268)
Total Gross Unrealized Loss	(9,160)	(11,663)
Residential Mortgage-Backed Securities \| Non-Agency RMBS - Interest-only
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gain Included in Accumulated Other Comprehensive Income	0	0
Gross Unrealized Gain Included in Cumulative Earnings	13,012	13,286
Total Gross Unrealized Gain	13,012	13,286
Gross Unrealized Loss Included in Accumulated Other Comprehensive Income	0	0
Gross Unrealized Loss Included in Cumulative Earnings	(82,291)	(80,786)
Total Gross Unrealized Loss	(82,291)	(80,786)
Residential Mortgage-Backed Securities \| Pass-through
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gain Included in Accumulated Other Comprehensive Income	0	0
Gross Unrealized Gain Included in Cumulative Earnings	29,845	54,015
Total Gross Unrealized Gain	29,845	54,015
Gross Unrealized Loss Included in Accumulated Other Comprehensive Income	0	0
Gross Unrealized Loss Included in Cumulative Earnings	(12,596)	(237)
Total Gross Unrealized Loss	(12,596)	(237)
Residential Mortgage-Backed Securities \| Agency RMBS - CMO
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gain Included in Accumulated Other Comprehensive Income	0	0
Gross Unrealized Gain Included in Cumulative Earnings	1,855	1,357
Total Gross Unrealized Gain	1,855	1,357
Gross Unrealized Loss Included in Accumulated Other Comprehensive Income	0	0
Gross Unrealized Loss Included in Cumulative Earnings	(173)	(133)
Total Gross Unrealized Loss	(173)	(133)
Residential Mortgage-Backed Securities \| Agency RMBS - Interest-only
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gain Included in Accumulated Other Comprehensive Income	0	0
Gross Unrealized Gain Included in Cumulative Earnings	3	65
Total Gross Unrealized Gain	3	65
Gross Unrealized Loss Included in Accumulated Other Comprehensive Income	0	0
Gross Unrealized Loss Included in Cumulative Earnings	(3,867)	(3,835)
Total Gross Unrealized Loss	(3,867)	(3,835)
Commercial Mortgage Backed Securities \| Agency CMBS - Project loans
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gain Included in Accumulated Other Comprehensive Income	0	0
Gross Unrealized Gain Included in Cumulative Earnings	0	0
Total Gross Unrealized Gain	0	0
Gross Unrealized Loss Included in Accumulated Other Comprehensive Income	0	0
Gross Unrealized Loss Included in Cumulative Earnings	(4,796)	(7,756)
Total Gross Unrealized Loss	(4,796)	(7,756)
Commercial Mortgage Backed Securities \| Agency CMBS - Interest-only
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gain Included in Accumulated Other Comprehensive Income	0	0
Gross Unrealized Gain Included in Cumulative Earnings	110	132
Total Gross Unrealized Gain	110	132
Gross Unrealized Loss Included in Accumulated Other Comprehensive Income	0	0
Gross Unrealized Loss Included in Cumulative Earnings	(784)	(830)
Total Gross Unrealized Loss	$ (784)	$ (830)

CHIMERA INVESTMENT CORP 10-Q