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Repurchase Agreements (Borrowings Under Repurchase Agreement) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Balance of repurchase agreements | $ 7,768,180 | $ 9,139,821
Repurchase Agreement Borrowings |  |
Debt Securities, Available-for-sale [Line Items] |  |
Balance of repurchase agreements | $ 7,768,991 | $ 9,140,944
Weighted Average Interest Rate | 3.14% | 2.99%
Less debt issuance costs | $ 811 | $ 1,123
Total repurchase agreements less debt issuance costs | 7,768,180 | 9,139,821
Repurchase Agreement Borrowings | Within 30 days |  |
Debt Securities, Available-for-sale [Line Items] |  |
Balance of repurchase agreements | $ 2,504,628 | $ 4,472,120
Weighted Average Interest Rate | 1.96% | 2.55%
Repurchase Agreement Borrowings | Over 30 days to 3 months |  |
Debt Securities, Available-for-sale [Line Items] |  |
Balance of repurchase agreements | $ 2,993,905 | $ 2,746,384
Weighted Average Interest Rate | 2.96% | 3.43%
Repurchase Agreement Borrowings | Over 3 months to 12 months |  |
Debt Securities, Available-for-sale [Line Items] |  |
Balance of repurchase agreements | $ 1,392,318 | $ 1,014,441
Weighted Average Interest Rate | 4.06% | 3.36%
Repurchase Agreement Borrowings | Over 12 months |  |
Debt Securities, Available-for-sale [Line Items] |  |
Balance of repurchase agreements | $ 878,140 | $ 907,999
Weighted Average Interest Rate | 5.65% | 3.44%

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- Definition Securities Sold Under Agreements To Repurchase, Net of Debt Issuance Costs + References No definition available. + Details
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- Definition Interest rate on the amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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 5: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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