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Net Interest Income - Components of Interest Income and Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Interest income | $ 52,186 | $ 47,970 | $ 102,225 | $ 258,583
Derivatives | 0 | 0 | 0 | 868
Interest expense | 20,711 | 19,444 | 40,410 | 182,976
Total net interest income | 31,475 | 28,526 | 61,815 | 75,607
Convertible Notes |  |  |  |
Interest expense | 2,788 | 2,739 | 5,572 | 5,474
Unsecured Debt |  |  |  |
Senior unsecured notes | 1,136 | 0 | 1,136 | 0
Subordinated debentures |  |  |  |
Subordinated debentures | 459 | 582 | 916 | 1,231
Residential loans |  |  |  |
Interest income | 20,155 | 17,471 | 39,816 | 39,153
Consolidated SLST | VIE, Primary Beneficiary |  |  |  |
Interest income | 10,479 | 11,522 | 20,797 | 23,646
Interest expense | 7,151 | 8,158 | 14,254 | 16,693
Residential loans held in securitization trusts |  |  |  |
Interest income | 9,933 | 427 | 17,901 | 921
Total residential loans |  |  |  |
Interest income | 40,567 | 29,420 | 78,514 | 63,720
Preferred equity and mezzanine loan investments |  |  |  |
Interest income | 4,130 | 5,202 | 8,531 | 10,575
Consolidated K-Series | VIE, Primary Beneficiary |  |  |  |
Interest income | 0 | 0 | 0 | 151,841
Interest expense | 0 | 0 | 0 | 129,762
Total multi-family loans |  |  |  |
Interest income | 4,130 | 5,202 | 8,531 | 162,416
Investment securities available for sale, at fair value |  |  |  |
Investment securities available for sale | 7,475 | 13,269 | 15,150 | 32,026
Other |  |  |  |
Other | 14 | 79 | 30 | 421
Other | 429 | 0 | 741 | 0
Repurchase agreements |  |  |  |
Interest expense | 3,733 | 7,366 | 7,773 | 28,112
Residential loan securitizations |  |  |  |
Interest expense | 5,015 | 130 | 9,735 | 367
Non-Agency RMBS Re-Securitization |  |  |  |
Interest expense | 0 | 469 | 283 | 469
Total collateralized debt obligations |  |  |  |
Interest expense | $ 12,166 | $ 8,757 | $ 24,272 | $ 147,291

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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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