Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets, at fair value
Unrealized appreciation on TBAs and interest rate futures contracts - at fair value	$ 17,027	$ 2,428
Total assets at fair value	3,070,806	2,496,758
Liabilities, at fair value
Non-recourse securitization obligation, collateralized by residential mortgage loans	483,041
Unrealized depreciation on futures contracts		728
Total liabilities	483,041	728
Non-Agency RMBS
Assets, at fair value
Debt securities, available-for-sale at fair value	84,442	113,579
Agency whole pool loan securities
Assets, at fair value
Debt securities, available-for-sale at fair value	406,846	372,055
Total AOMT CMBS
Assets, at fair value
Debt securities, available-for-sale at fair value	10,055	10,756
U.S. Treasury Bills
Assets, at fair value
Debt securities, available-for-sale at fair value	349,992	249,999
Interest rate futures
Assets, at fair value
Unrealized appreciation on TBAs and interest rate futures contracts - at fair value	13,279
TBAs
Assets, at fair value
Unrealized appreciation on TBAs and interest rate futures contracts - at fair value	3,748
Residential mortgage loans
Assets, at fair value
Fair Value	1,103,773	1,061,912
Residential mortgage loans in securitization trust
Assets, at fair value
Fair Value	1,077,967	667,365
Commercial mortgage loans
Assets, at fair value
Fair Value	20,704	18,664
Level 1
Assets, at fair value
Unrealized appreciation on TBAs and interest rate futures contracts - at fair value		2,428
Total assets at fair value	367,019	252,427
Liabilities, at fair value
Non-recourse securitization obligation, collateralized by residential mortgage loans	0
Unrealized depreciation on futures contracts		728
Total liabilities	0	728
Level 1 \| Non-Agency RMBS
Assets, at fair value
Debt securities, available-for-sale at fair value	0	0
Level 1 \| Agency whole pool loan securities
Assets, at fair value
Debt securities, available-for-sale at fair value	0	0
Level 1 \| Total AOMT CMBS
Assets, at fair value
Debt securities, available-for-sale at fair value	0	0
Level 1 \| U.S. Treasury Bills
Assets, at fair value
Debt securities, available-for-sale at fair value	349,992	249,999
Level 1 \| Interest rate futures
Assets, at fair value
Unrealized appreciation on TBAs and interest rate futures contracts - at fair value	13,279
Level 1 \| TBAs
Assets, at fair value
Unrealized appreciation on TBAs and interest rate futures contracts - at fair value	3,748
Level 1 \| Residential mortgage loans
Assets, at fair value
Fair Value	0	0
Level 1 \| Residential mortgage loans in securitization trust
Assets, at fair value
Fair Value	0	0
Level 1 \| Commercial mortgage loans
Assets, at fair value
Fair Value	0	0
Level 2
Assets, at fair value
Unrealized appreciation on TBAs and interest rate futures contracts - at fair value		0
Total assets at fair value	2,695,854	2,237,212
Liabilities, at fair value
Non-recourse securitization obligation, collateralized by residential mortgage loans	483,041
Unrealized depreciation on futures contracts		0
Total liabilities	483,041	0
Level 2 \| Non-Agency RMBS
Assets, at fair value
Debt securities, available-for-sale at fair value	84,442	113,579
Level 2 \| Agency whole pool loan securities
Assets, at fair value
Debt securities, available-for-sale at fair value	406,846	372,055
Level 2 \| Total AOMT CMBS
Assets, at fair value
Debt securities, available-for-sale at fair value	10,055	10,756
Level 2 \| U.S. Treasury Bills
Assets, at fair value
Debt securities, available-for-sale at fair value	0	0
Level 2 \| Interest rate futures
Assets, at fair value
Unrealized appreciation on TBAs and interest rate futures contracts - at fair value	0
Level 2 \| TBAs
Assets, at fair value
Unrealized appreciation on TBAs and interest rate futures contracts - at fair value	0
Level 2 \| Residential mortgage loans
Assets, at fair value
Fair Value	1,097,275	1,056,875
Level 2 \| Residential mortgage loans in securitization trust
Assets, at fair value
Fair Value	1,076,532	665,802
Level 2 \| Commercial mortgage loans
Assets, at fair value
Fair Value	20,704	18,145
Level 3
Assets, at fair value
Unrealized appreciation on TBAs and interest rate futures contracts - at fair value		0
Total assets at fair value	7,933	7,119
Liabilities, at fair value
Non-recourse securitization obligation, collateralized by residential mortgage loans	0
Unrealized depreciation on futures contracts		0
Total liabilities	0	0
Level 3 \| Non-Agency RMBS
Assets, at fair value
Debt securities, available-for-sale at fair value	0	0
Level 3 \| Agency whole pool loan securities
Assets, at fair value
Debt securities, available-for-sale at fair value	0	0
Level 3 \| Total AOMT CMBS
Assets, at fair value
Debt securities, available-for-sale at fair value	0	0
Level 3 \| U.S. Treasury Bills
Assets, at fair value
Debt securities, available-for-sale at fair value	0	0
Level 3 \| Interest rate futures
Assets, at fair value
Unrealized appreciation on TBAs and interest rate futures contracts - at fair value	0
Level 3 \| TBAs
Assets, at fair value
Unrealized appreciation on TBAs and interest rate futures contracts - at fair value	0
Level 3 \| Residential mortgage loans
Assets, at fair value
Fair Value	6,498	5,037
Level 3 \| Residential mortgage loans in securitization trust
Assets, at fair value
Fair Value	1,435	1,563
Level 3 \| Commercial mortgage loans
Assets, at fair value
Fair Value	$ 0	$ 519

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value of financial and nonfinancial obligations.

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