Schedule of Repurchase Agreements by Term, Short or Long (Details) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Assets Sold under Agreements to Repurchase [Line Items] | ||
| Repurchase agreements | $ 19,451,207 | $ 8,865,184 |
| Maturity up to One Year [Member] | ||
| Assets Sold under Agreements to Repurchase [Line Items] | ||
| Repurchase agreements | 19,338,707 | 8,865,184 |
| Maturity Over One Year [Member] | ||
| Assets Sold under Agreements to Repurchase [Line Items] | ||
| Repurchase agreements | $ 112,500 | $ 0 |
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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. No definition available.
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- Definition 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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