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Segment Information - Origination Data (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($) loan | Dec. 31, 2023 USD ($) loan | Dec. 31, 2022 USD ($) loan
Segment Reporting Information [Line Items] |  |  |
Total Loan Commitment Volume | $ 4,443,972 | $ 5,207,148 | $ 5,146,718
Agency Business Loan Sales Data: |  |  |
(Loss) gain on derivative instruments, net | (8,543) | 6,763 | 26,609
Structured Business |  |  |
Segment Reporting Information [Line Items] |  |  |
Total New Loan Originations | 1,425,799 | 983,343 | 6,151,647
Loan runoff | 2,691,583 | 3,354,055 | 3,818,554
Structured Business | Bridge |  |  |
Segment Reporting Information [Line Items] |  |  |
Total New Loan Originations | 1,324,126 | 939,390 | 6,082,041
Commitments: | 1,539,841 | 1,150,687 | 1,086,833
Structured Business | Mezzanine loans |  |  |
Segment Reporting Information [Line Items] |  |  |
Total New Loan Originations | 97,305 | 43,953 | 69,606
Structured Business | Multifamily |  |  |
Segment Reporting Information [Line Items] |  |  |
Total New Loan Originations | 4,368 | 0 | 0
Structured Business | Multifamily | Bridge |  |  |
Segment Reporting Information [Line Items] |  |  |
Total New Loan Originations | 444,635 | 415,330 | 5,468,222
Commitments: | 101,000 | 0 | 0
Structured Business | SFR - Fixed Rate | Bridge |  |  |
Segment Reporting Information [Line Items] |  |  |
Total New Loan Originations | $ 869,141 | $ 524,060 | $ 613,819
Number of Loans Originated | loan | 170 | 150 | 318
Commitments: | $ 1,438,841 | $ 1,150,687 | $ 1,086,833
Structured Business | Land | Bridge |  |  |
Segment Reporting Information [Line Items] |  |  |
Total New Loan Originations | 10,350 | 0 | 0
Agency Business |  |  |
Segment Reporting Information [Line Items] |  |  |
Origination Volumes | 4,470,773 | 5,106,820 | 4,768,186
Agency Business Loan Sales Data: |  |  |
Loan Sales | $ 4,609,686 | $ 4,889,199 | $ 5,438,623
Sales margin (fee-based services as a % of loan sales) | 1.63% | 1.48% | 1.34%
MSR Rate (MSR income as a % of loan commitments) | 1.15% | 1.34% | 1.35%
Agency Business | SFR - Fixed Rate |  |  |
Segment Reporting Information [Line Items] |  |  |
Origination Volumes | $ 27,314 | $ 19,328 | $ 89,683
Agency Business Loan Sales Data: |  |  |
Loan Sales | 27,314 | 22,931 | 86,071
Agency Business | Fannie Mae |  |  |
Segment Reporting Information [Line Items] |  |  |
Origination Volumes | 2,374,040 | 3,773,532 | 2,919,566
Agency Business Loan Sales Data: |  |  |
Loan Sales | 2,680,018 | 3,469,340 | 3,139,414
Agency Business | Freddie Mac |  |  |
Segment Reporting Information [Line Items] |  |  |
Origination Volumes | 1,770,976 | 756,827 | 1,353,001
Agency Business Loan Sales Data: |  |  |
Loan Sales | 1,662,010 | 715,530 | 1,456,595
Agency Business | Private Label |  |  |
Segment Reporting Information [Line Items] |  |  |
Origination Volumes | 151,936 | 299,934 | 217,542
Agency Business Loan Sales Data: |  |  |
Loan Sales | 124,286 | 441,319 | 515,086
(Loss) gain on derivative instruments, net |  |  | 17,100
Agency Business | FHA |  |  |
Segment Reporting Information [Line Items] |  |  |
Origination Volumes | 146,507 | 257,199 | 188,394
Agency Business Loan Sales Data: |  |  |
Loan Sales | $ 116,058 | $ 240,079 | $ 241,457

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