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SECURED FINANCING - Additional Information (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Repurchase Agreements: |  |  |
Repurchase agreements outstanding | $ 105,181,241 | $ 81,115,874 | [1]
Repurchase agreements - weighted average effective borrowing rates | 2.44% | 2.36% |
Repurchase agreements - weighted average remaining maturities | 70 days | 77 days |
Maximum repurchase agreements available under counterparty arrangements | $ 1,100,000 |  |
Commitments available to be drawn | 890,000 |  |
Other secured financing long term, amount | 4,127,989 | $ 4,183,311 | [1]
Secured financings and interest rate swaps - collateral held, estimated fair value | 116,200,000 | 90,200,000 |
Secured financings and interest rate swaps - collateral held, accrued interest | 379,100 | 303,100 |
Fair value of collateral received in reverse repurchase agreements | $ 15,500 | $ 650,000 |
Minimum |  |  |
Repurchase Agreements: |  |  |
Maturity period | 5 years |  |
Maximum |  |  |
Repurchase Agreements: |  |  |
Maturity period | 7 years |  |
Maturity Period Beyond Three Years | Period Two | Minimum |  |  |
Repurchase Agreements: |  |  |
Maturity period | 1 year | 1 year |
Maturity Period Beyond Three Years | Period Two | Maximum |  |  |
Repurchase Agreements: |  |  |
Maturity period | 3 years | 3 years |
FHLB De Moines |  |  |
Repurchase Agreements: |  |  |
Debt weighted average interest rate | 2.79% | 2.78% |
Stock held in FHLB | $ 147,900 | $ 147,900 |
FHLB De Moines | Maturity Period Beyond Three Years | Period One |  |  |
Repurchase Agreements: |  |  |
Other secured financing long term, amount | 90,000 |  |
FHLB De Moines | Maturity Period Beyond Three Years | Period Two |  |  |
Repurchase Agreements: |  |  |
Other secured financing long term, amount | 3,500,000 | 3,600,000 |
U.S. Treasury Securities |  |  |
Repurchase Agreements: |  |  |
Repurchase agreements outstanding |  | 640,465 |
1 day |  |  |
Repurchase Agreements: |  |  |
Repurchase agreements outstanding | 23,192,254 | 0 |
1 day | U.S. Treasury Securities |  |  |
Repurchase Agreements: |  |  |
Repurchase agreements outstanding |  | 0 |
2 to 29 days |  |  |
Repurchase Agreements: |  |  |
Repurchase agreements outstanding | 11,919,883 | 32,012,641 |
2 to 29 days | U.S. Treasury Securities |  |  |
Repurchase Agreements: |  |  |
Repurchase agreements outstanding |  | 640,465 |
30 to 59 days |  |  |
Repurchase Agreements: |  |  |
Repurchase agreements outstanding | 6,778,783 | 8,164,165 |
30 to 59 days | U.S. Treasury Securities |  |  |
Repurchase Agreements: |  |  |
Repurchase agreements outstanding |  | 0 |
60 to 89 days |  |  |
Repurchase Agreements: |  |  |
Repurchase agreements outstanding | 26,845,611 | 18,689,772 |
60 to 89 days | U.S. Treasury Securities |  |  |
Repurchase Agreements: |  |  |
Repurchase agreements outstanding |  | 0 |
90 to 119 days |  |  |
Repurchase Agreements: |  |  |
Repurchase agreements outstanding | 13,002,459 | 10,067,183 |
90 to 119 days | U.S. Treasury Securities |  |  |
Repurchase Agreements: |  |  |
Repurchase agreements outstanding |  | 0 |
Over 120 days |  |  |
Repurchase Agreements: |  |  |
Repurchase agreements outstanding | $ 23,442,251 | 12,182,113 |
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 Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809 + Details
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