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Borrowings Summary of Repurchase Agreements (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Securities Sold Under Agreements to Repurchase |  |
Repurchase Agreements | $ 362,573 | $ 473,650
Overnight and Continuous |  |
Securities Sold Under Agreements to Repurchase |  |
Repurchase Agreements | 362,573 | 473,007
Up to 30 Days |  |
Securities Sold Under Agreements to Repurchase |  |
Repurchase Agreements | 0 | 643
Residential mortgage backed securities |  |
Securities Sold Under Agreements to Repurchase |  |
Repurchase Agreements | 360,751 | 472,349
Residential mortgage backed securities | Overnight and Continuous |  |
Securities Sold Under Agreements to Repurchase |  |
Repurchase Agreements | 360,751 | 471,706
Residential mortgage backed securities | Up to 30 Days |  |
Securities Sold Under Agreements to Repurchase |  |
Repurchase Agreements | 0 | 643
Commercial mortgage backed securities |  |
Securities Sold Under Agreements to Repurchase |  |
Repurchase Agreements | 1,822 | 1,301
Commercial mortgage backed securities | Overnight and Continuous |  |
Securities Sold Under Agreements to Repurchase |  |
Repurchase Agreements | 1,822 | 1,301
Commercial mortgage backed securities | Up to 30 Days |  |
Securities Sold Under Agreements to Repurchase |  |
Repurchase Agreements | $ 0 | $ 0

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- Definition Amount, before 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 elected not 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 (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + 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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