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Multifamily Loans (Details) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan |  |  | 669 | 1,484
Total Principal | $ | $ 524,928 | $ 1,034,284 | $ 524,928 | $ 1,034,284
Multifamily loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 279 | 162 | 279 | 162
Total Principal | $ | $ 4,195,000 | $ 2,126,698 | $ 4,195,000 | $ 2,126,698
Residential loans | $ | $ 4,410,000 | $ 2,140,000 | $ 4,410,000 | 2,140,000
Weighted average original loan-to-value (LTV) | 69.00% |  | 69.00% |
Weighted average coupon rate | 4.13% |  | 4.13% |
Contract maturities |  |  | 6 years |
Number of loans past due | loan | 0 |  | 0 |
Number of loans in foreclosure | loan | 0 |  | 0 |
Valuation adjustment gain (loss) | $ |  |  | $ 130,000 | $ 47,000
Multifamily loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Weighted average maturity (in years) |  |  | 7 years |
Multifamily loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Weighted average maturity (in years) |  |  | 10 years |

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