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Repurchase Agreements Remaining Term to Maturity (Details) $ in Thousands | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
--- | --- | ---
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Balance | $ 2,565,902 | $ 2,898,952
WAVG Original Term to Maturity | 54 | 63
Less than 30 days |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Balance | $ 2,240,791 | $ 2,480,213
WAVG Original Term to Maturity | 49 | 58
30 to 90 days |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Balance | $ 274,231 | $ 418,739
WAVG Original Term to Maturity | 90 | 87
Maturity Greater than 90 Days [Member] |  |
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items] |  |
Balance | $ 50,880 | $ 0
WAVG Original Term to Maturity | 121 | 0

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- Definition The length of time measured in days between the original date a repurchase agreement amount was borrowed and its maturity (or interest rate reset) date. + 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 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://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)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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