Consolidated Securitization Vehicles and Other Variable Interest Entities - Assets and Liabilities Related to the Consolidated VIEs (Details) - USD ($) $ in Thousands		Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Assets:
Non-Agency RMBS, at fair value		$ 1,121,836		$ 1,043,806
Loans held for investment, at fair value		11,283,775		11,397,046
Accrued interest receivable		76,952		76,960
Other assets		103,472		87,018
Total assets	[1]	13,702,376		12,928,998
Liabilities:
Securitized debt, collateralized by Non-Agency RMBS		72,174		75,012
Securitized debt at fair value, collateralized by Loans held for investment		7,314,411		7,601,881
Accrued interest payable		39,797		38,272
Other liabilities		17,634		9,355
Total liabilities	[1]	10,965,064		10,370,079
Allowance for credit losses		23,949	$ 23,591	18,560	$ 16,230	$ 13,013	$ 7,188
Variable Interest Entities, Primary Beneficiary
Assets:
Non-Agency RMBS, at fair value		241,017		248,993
Loans held for investment, at fair value		10,142,236		10,184,538
Accrued interest receivable		51,702		52,712
Other assets		18,226		15,597
Total assets		10,453,181		10,501,840
Liabilities:
Securitized debt, collateralized by Non-Agency RMBS		72,174		75,012
Securitized debt at fair value, collateralized by Loans held for investment		7,639,906		7,248,768
Accrued interest payable		24,155		23,310
Other liabilities		1,599		2,019
Total liabilities		7,737,834		7,349,109
Allowance for credit losses		$ 8,000		$ 6,000

[1] The Company's consolidated statements of financial condition include assets of consolidated variable interest entities, or VIEs, that can only be used to settle obligations and liabilities of the VIE for which creditors do not have recourse to the primary beneficiary (Chimera Investment Corporation). As of September 30, 2024, and December 31, 2023, total assets of consolidated VIEs were $10,453,181 and $10,501,840, respectively, and total liabilities of consolidated VIEs were $7,737,834 and $7,349,109, respectively. See Note 9 for further discussion.