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SECURED FINANCING - Repurchase Agreements - Remaining Maturities, Collateral Types and Weighted Average Rate (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | $ 88,554,170 |  |  | $ 81,115,874 | [1]
Weighted Average Rate | 2.86% |  |  | 2.97% |
Percentage of total repurchase agreements with remaining maturity of 1 year | 1.00% | 1.00% | 1.00% |  |
CRTs |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | $ 340,426 |  |  | $ 373,536 |
Non-Agency Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 797,087 |  |  | 721,304 |
Commercial Loans |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 200,040 |  |  | 693,939 |
Agency Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 86,939,320 |  |  | 78,482,373 |
Commercial Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 277,297 |  |  | 204,257 |
U.S. Treasury Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding |  |  |  | 640,465 |
1 day |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | $ 19,083,282 |  |  | $ 0 |
Weighted Average Rate | 3.41% |  |  | 0.00% |
1 day | CRTs |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | $ 0 |  |  | $ 0 |
1 day | Non-Agency Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 0 |  |  | 0 |
1 day | Commercial Loans |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 0 |  |  | 0 |
1 day | Agency Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 19,025,744 |  |  | 0 |
1 day | Commercial Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 57,538 |  |  | 0 |
1 day | U.S. Treasury Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding |  |  |  | 0 |
2 to 29 days |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | $ 19,107,841 |  |  | $ 32,012,641 |
Weighted Average Rate | 2.64% |  |  | 3.50% |
2 to 29 days | CRTs |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | $ 283,222 |  |  | $ 284,906 |
2 to 29 days | Non-Agency Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 438,446 |  |  | 353,429 |
2 to 29 days | Commercial Loans |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 0 |  |  | 0 |
2 to 29 days | Agency Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 18,313,263 |  |  | 30,661,001 |
2 to 29 days | Commercial Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 72,910 |  |  | 72,840 |
2 to 29 days | U.S. Treasury Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding |  |  |  | 640,465 |
30 to 59 days |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | $ 5,220,636 |  |  | $ 8,164,165 |
Weighted Average Rate | 2.68% |  |  | 2.33% |
30 to 59 days | CRTs |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | $ 0 |  |  | $ 0 |
30 to 59 days | Non-Agency Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 0 |  |  | 0 |
30 to 59 days | Commercial Loans |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 0 |  |  | 0 |
30 to 59 days | Agency Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 5,190,135 |  |  | 8,164,165 |
30 to 59 days | Commercial Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 30,501 |  |  | 0 |
30 to 59 days | U.S. Treasury Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding |  |  |  | 0 |
60 to 89 days |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | $ 20,762,400 |  |  | $ 18,689,772 |
Weighted Average Rate | 2.69% |  |  | 2.62% |
60 to 89 days | CRTs |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | $ 57,204 |  |  | $ 88,630 |
60 to 89 days | Non-Agency Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 245,553 |  |  | 251,441 |
60 to 89 days | Commercial Loans |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 0 |  |  | 0 |
60 to 89 days | Agency Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 20,414,594 |  |  | 18,326,399 |
60 to 89 days | Commercial Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 45,049 |  |  | 23,302 |
60 to 89 days | U.S. Treasury Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding |  |  |  | 0 |
90 to 119 days |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | $ 1,867,443 |  |  | $ 10,067,183 |
Weighted Average Rate | 2.70% |  |  | 2.54% |
90 to 119 days | CRTs |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | $ 0 |  |  | $ 0 |
90 to 119 days | Non-Agency Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 0 |  |  | 0 |
90 to 119 days | Commercial Loans |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 0 |  |  | 0 |
90 to 119 days | Agency Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 1,867,443 |  |  | 10,067,183 |
90 to 119 days | Commercial Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 0 |  |  | 0 |
90 to 119 days | U.S. Treasury Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding |  |  |  | 0 |
Over 120 days |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | $ 22,512,568 |  |  | $ 12,182,113 |
Weighted Average Rate | 2.77% |  |  | 2.92% |
Over 120 days | CRTs |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | $ 0 |  |  | $ 0 |
Over 120 days | Non-Agency Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 113,088 |  |  | 116,434 |
Over 120 days | Commercial Loans |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 200,040 |  |  | 693,939 |
Over 120 days | Agency Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | 22,128,141 |  |  | 11,263,625 |
Over 120 days | Commercial Mortgage-Backed Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding | $ 71,299 |  |  | 108,115 |
Over 120 days | U.S. Treasury Securities |  |  |  |  |
Repurchase Agreements: |  |  |  |  |
Repurchase agreements outstanding |  |  |  | $ 0 |
[1] | (1) Derived from the audited consolidated financial statements at December 31, 2018.

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- Definition Percent Of Total Repurchase Agreements With Remaining Maturity Over 1 Year + References No definition available. + Details
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- Definition Weighted average rate of repurchase agreements. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 + Details
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