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Segment Information - Origination Data (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) loan | Dec. 31, 2022 USD ($) loan | Dec. 31, 2021 USD ($) loan
Segment Reporting Information [Line Items] |  |  |  |
Origination Volumes |  | $ 5,207,148 | $ 5,146,718 | $ 6,347,752
Agency Business Loan Sales Data: |  |  |  |
Gain (loss) on derivative instruments, net |  | 6,763 | 26,609 | (2,684)
Structured Business | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total new loan originations |  | 983,343 | 6,151,647 | 9,720,515
Loan runoff |  | 3,354,055 | 3,818,554 | 2,516,771
Agency Business Loan Sales Data: |  |  |  |
Gain (loss) on derivative instruments, net |  | 0 | 0 | 0
Structured Business | Bridge | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total new loan originations |  | 939,390 | 6,082,041 | 9,516,640
Structured Business | Mezzanine loans | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total new loan originations |  | 43,953 | 69,606 | 203,875
Structured Business | Multifamily | Bridge | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total new loan originations |  | 415,330 | 5,468,222 | 9,101,139
Structured Business | SFR - Fixed Rate | Bridge | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total new loan originations |  | $ 524,060 | $ 613,819 | $ 415,501
Number of Loans Originated | loan |  | 150 | 318 | 422
SFR Commitments |  | $ 1,150,687 | $ 1,086,833 | $ 760,448
Agency Business |  |  |  |
Agency Business Loan Sales Data: |  |  |  |
Loan Sales |  | $ 4,889,199 | $ 5,438,623 | $ 6,415,169
Sales margin (fee-based services as a % of loan sales) |  | 1.48% | 1.34% | 1.92%
MSR rate (MSR income as a % of loan commitments) |  | 1.34% | 1.35% | 2.05%
Agency Business | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Origination Volumes |  | $ 5,106,820 | $ 4,768,186 | $ 6,409,558
Agency Business Loan Sales Data: |  |  |  |
Gain (loss) on derivative instruments, net |  | 6,763 | 26,609 | (2,684)
Agency Business | SFR - Fixed Rate |  |  |  |
Agency Business Loan Sales Data: |  |  |  |
Loan Sales |  | 22,931 | 86,071 | 192,335
Agency Business | SFR - Fixed Rate | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Origination Volumes |  | 19,328 | 89,683 | 136,931
Agency Business | Fannie Mae |  |  |  |
Agency Business Loan Sales Data: |  |  |  |
Loan Sales |  | 3,469,340 | 3,139,414 | 3,675,763
Agency Business | Fannie Mae | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Origination Volumes |  | 3,773,532 | 2,919,566 | 3,389,312
Agency Business | Freddie Mac |  |  |  |
Agency Business Loan Sales Data: |  |  |  |
Loan Sales |  | 715,530 | 1,456,595 | 1,081,702
Agency Business | Freddie Mac | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Origination Volumes |  | 756,827 | 1,353,001 | 1,016,142
Agency Business | Private Label |  |  |  |
Agency Business Loan Sales Data: |  |  |  |
Loan Sales |  | 441,319 | 515,086 | 985,094
Gain (loss) on derivative instruments, net | $ 17,100 |  |  |
Agency Business | Private Label | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Origination Volumes |  | 299,934 | 217,542 | 1,436,853
Agency Business | FHA |  |  |  |
Agency Business Loan Sales Data: |  |  |  |
Loan Sales |  | 240,079 | 241,457 | 480,275
Agency Business | FHA | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Origination Volumes |  | $ 257,199 | $ 188,394 | $ 430,320

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