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Net Interest Income - Components of Interest Income and Interest Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Interest income | $ 58,501 | $ 50,039
Interest expense | 28,622 | 19,699
Total net interest income | 29,879 | 30,340
Convertible notes |  |
Interest expense | 438 | 2,784
Senior unsecured notes |  |
Senior unsecured notes | 1,603 | 0
Subordinated debentures |  |
Subordinated debentures | 459 | 457
Residential loans |  |
Interest income | 24,834 | 19,662
Consolidated SLST | VIE, Primary Beneficiary |  |
Interest income | 9,380 | 10,318
Interest expense | 5,978 | 7,104
Residential loans held in securitization trusts |  |
Interest income | 16,633 | 7,968
Total residential loans |  |
Interest income | 50,847 | 37,948
Multi-family loans |  |
Interest income | 2,951 | 4,401
Investment securities available for sale |  |
Investment securities available for sale | 4,675 | 7,675
Other |  |
Other | 28 | 15
Repurchase agreements |  |
Interest expense | 5,531 | 4,040
Residential loan securitizations |  |
Interest expense | 7,456 | 4,720
Non-Agency RMBS Re-Securitization |  |
Interest expense | 0 | 283
Total collateralized debt obligations |  |
Interest expense | 13,434 | 12,107
Mortgages payable on real estate |  |
Mortgages payable on real estate | $ 7,157 | $ 311

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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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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (210.5-03(11)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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