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Loans Held for Investment, net - Loan Portfolio (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) loan | Dec. 31, 2022 USD ($) loan | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | loan | 25 | 27 |  |
Amortized Cost | $ | $ 622,070 | $ 669,929 | $ 622,710 | $ 570,780
Percentage of Value | 100.00% | 100.00% |  |
Midwest |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | loan | 8 | 9 |  |
Amortized Cost | $ | $ 235,289 | $ 251,208 |  |
Percentage of Value | 38.00% | 37.00% |  |
West |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | loan | 8 | 8 |  |
Amortized Cost | $ | $ 148,085 | $ 146,837 |  |
Percentage of Value | 24.00% | 22.00% |  |
South |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | loan | 5 | 6 |  |
Amortized Cost | $ | $ 133,243 | $ 166,616 |  |
Percentage of Value | 21.00% | 25.00% |  |
East |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | loan | 4 | 4 |  |
Amortized Cost | $ | $ 105,453 | $ 105,268 |  |
Percentage of Value | 17.00% | 16.00% |  |
Office |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | loan | 10 | 11 |  |
Amortized Cost | $ | $ 244,302 | $ 252,796 |  |
Percentage of Value | 39.00% | 38.00% |  |
Multifamily |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | loan | 8 | 8 |  |
Amortized Cost | $ | $ 198,390 | $ 197,229 |  |
Percentage of Value | 32.00% | 29.00% |  |
Retail |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | loan | 4 | 4 |  |
Amortized Cost | $ | $ 110,037 | $ 109,248 |  |
Percentage of Value | 18.00% | 16.00% |  |
Industrial |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | loan | 3 | 4 |  |
Amortized Cost | $ | $ 69,341 | $ 110,656 |  |
Percentage of Value | 11.00% | 17.00% |  |

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