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Loans and Investments - Non-performing loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Past Due [Line Items] |  |
UPB | $ 427,929 | $ 157,960
Loans and investments, gross | 12,615,006 | 14,456,123
Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
UPB | 274,152 | 7,750
Less Than 90 Days Past Due | Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and investments, gross | 0 | 0
Greater Than 90 Days Past Due | Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and investments, gross | 274,152 | 7,750
Multifamily |  |
Financing Receivable, Past Due [Line Items] |  |
UPB | 272,493 |
Multifamily | Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
UPB | 271,532 | 2,605
Multifamily | Less Than 90 Days Past Due | Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and investments, gross | 0 | 0
Multifamily | Greater Than 90 Days Past Due | Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and investments, gross | 271,532 | 2,605
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
UPB | 1,700 | 1,700
Commercial | Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
UPB | 1,700 | 1,700
Commercial | Less Than 90 Days Past Due | Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and investments, gross | 0 | 0
Commercial | Greater Than 90 Days Past Due | Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and investments, gross | 1,700 | 1,700
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
UPB | 19,521 | 22,045
Retail | Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
UPB | 920 | 3,445
Retail | Less Than 90 Days Past Due | Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and investments, gross | 0 | 0
Retail | Greater Than 90 Days Past Due | Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and investments, gross | $ 920 | $ 3,445

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