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Repurchase Agreements Repurchase Agreements (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets Sold under Agreements to Repurchase, Repurchase Liability | $ 179,670 | $ 176,913
U.S. Government agency securities |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets Sold under Agreements to Repurchase, Repurchase Liability | 20,219 | 20,233
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets Sold under Agreements to Repurchase, Repurchase Liability | 63,931 | 79,079
Collateralized Debt Obligations [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets Sold under Agreements to Repurchase, Repurchase Liability | 95,520 | 77,601
Maturity Overnight [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets Sold under Agreements to Repurchase, Repurchase Liability | 179,670 | 176,913
Maturity Overnight [Member] | U.S. Government agency securities |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets Sold under Agreements to Repurchase, Repurchase Liability | 20,219 | 20,233
Maturity Overnight [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets Sold under Agreements to Repurchase, Repurchase Liability | 63,931 | 79,079
Maturity Overnight [Member] | Collateralized Debt Obligations [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets Sold under Agreements to Repurchase, Repurchase Liability | $ 95,520 | $ 77,601

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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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