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Net Interest Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Total interest income | $ 206,866 | $ 350,161 | $ 694,614
Derivatives | 0 | 868 | 711
Total interest expense | 83,248 | 223,068 | 566,750
Total net interest income | 123,618 | 127,093 | 127,864
Convertible debt |  |  |
Interest expense | 11,196 | 10,997 | 10,813
Senior unsecured notes |  |  |
Senior unsecured notes | 4,335 | 0 | 0
Subordinated debentures |  |  |
Subordinated debentures | 1,831 | 2,187 | 2,865
Residential loans |  |  |
Interest income | 83,852 | 69,170 | 63,031
Consolidated SLST | VIE, Primary Beneficiary |  |  |
Interest income | 40,944 | 45,194 | 4,764
Interest expense | 28,135 | 31,663 | 2,945
Residential loans held in securitization trusts |  |  |
Interest income | 38,941 | 12,612 | 3,222
Total residential loans |  |  |
Interest income | 163,737 | 126,976 | 71,017
Preferred equity and mezzanine loan investments |  |  |
Interest income | 15,321 | 20,899 | 20,899
Consolidated K-Series | VIE, Primary Beneficiary |  |  |
Interest income | 0 | 151,841 | 535,226
Interest expense | 0 | 129,762 | 457,130
Total multi-family loans |  |  |
Interest income | 15,321 | 172,740 | 556,125
Investment securities available for sale |  |  |
Investment securities available for sale | 27,750 | 49,925 | 65,486
Other |  |  |
Other | 58 | 520 | 1,986
Mortgages payable on operating real estate | 3,964 | 0 | 0
Repurchase agreements |  |  |
Interest expense | 13,844 | 37,334 | 90,110
Residential loan securitizations |  |  |
Interest expense | 19,660 | 6,967 | 1,682
Non-Agency RMBS and CMBS re-securitizations |  |  |
Interest expense | 283 | 3,290 | 494
Total collateralized debt obligations |  |  |
Interest expense | $ 48,078 | $ 171,682 | $ 462,251

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