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Loans and Investments - Schedule of Non-performing loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Financing Receivable, Past Due [Line Items] |  |
UPB | $ 611,696 | $ 427,929
Loans and investments, gross | 11,304,956 | 12,615,006
Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
UPB | 651,847 | 274,152
Interest receivable | 23,200 | 92,500
Carrying Value | Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and investments, gross | 622,682 | 262,739
Financial Asset, Greater Than 60 Days Past Due | Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
Interest receivable | 0 | 0
Multifamily |  |
Financing Receivable, Past Due [Line Items] |  |
UPB | 456,261 | 272,493
Multifamily | Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
UPB | 649,227 | 271,532
Multifamily | Carrying Value | Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and investments, gross | 620,072 | 260,129
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 | Carrying Value | 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 | 19,520 | 19,521
Retail | Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
UPB | 920 | 920
Retail | Carrying Value | Non-performing loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans and investments, gross | $ 910 | $ 910

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