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Loans and Investments - Schedule of Non-Performing Loans (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Loans and Investments |  |
UPB | $ 629,255 | $ 427,929
Loans and investments, gross | 11,565,538 | 12,615,006
Non-performing loans |  |
Loans and Investments |  |
UPB | 625,366 | 274,152
Loans and investments, gross | 594,292 | 262,739
Multifamily |  |
Loans and Investments |  |
UPB | 473,820 | 272,494
Multifamily | Non-performing loans |  |
Loans and Investments |  |
UPB | 622,746 | 271,532
Loans and investments, gross | 591,682 | 260,129
Commercial |  |
Loans and Investments |  |
UPB | 1,700 | 1,700
Commercial | Non-performing loans |  |
Loans and Investments |  |
UPB | 1,700 | 1,700
Loans and investments, gross | 1,700 | 1,700
Retail |  |
Loans and Investments |  |
UPB | 19,520 | 19,520
Retail | Non-performing loans |  |
Loans and Investments |  |
UPB | 920 | 920
Loans and investments, gross | $ 910 | $ 910

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