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Loans and Investments - Non-performing loans (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Loans and Investments
UPB	$ 293,055	$ 157,960
Loans and investments, gross	13,122,395	14,456,123
Non-performing loans
Loans and Investments
UPB	157,862	7,750
Less Than 90 Days Past Due | Non-performing loans
Loans and Investments
Loans and investments, gross	122,847	0
Greater Than 90 Days Past Due | Non-performing loans
Loans and Investments
Loans and investments, gross	35,015	7,750
Multifamily
Loans and Investments
UPB	90,070
Multifamily | Non-performing loans
Loans and Investments
UPB	152,717	2,605
Multifamily | Less Than 90 Days Past Due | Non-performing loans
Loans and Investments
Loans and investments, gross	122,847	0
Multifamily | Greater Than 90 Days Past Due | Non-performing loans
Loans and Investments
Loans and investments, gross	29,870	2,605
Retail
Loans and Investments
UPB	22,045	22,045
Retail | Non-performing loans
Loans and Investments
UPB	3,445	3,445
Retail | Less Than 90 Days Past Due | Non-performing loans
Loans and Investments
Loans and investments, gross	0	0
Retail | Greater Than 90 Days Past Due | Non-performing loans
Loans and Investments
Loans and investments, gross	3,445	3,445
Commercial
Loans and Investments
UPB	1,700	1,700
Commercial | Non-performing loans
Loans and Investments
UPB	1,700	1,700
Commercial | Less Than 90 Days Past Due | Non-performing loans
Loans and Investments
Loans and investments, gross	0	0
Commercial | Greater Than 90 Days Past Due | Non-performing loans
Loans and Investments
Loans and investments, gross	$ 1,700	$ 1,700

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

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- Definition

Amount at par value of financing receivable purchased with credit deterioration.

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+ References

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