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Repurchase Agreements Repurchase Agreements (Details) - Maturity Overnight [Member] - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Assets Sold under Agreements to Repurchase [Line Items] |  |  |
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement | [1] | $ 141,176 | $ 162,679
U.S. Government agency securities |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement |  | 14,664 | 16,867
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement |  | 57,378 | 51,273
Collateralized Mortgage Backed Securities [Member] |  |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |  |
Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement |  | $ 69,134 | $ 94,539
[1] | All customer repurchase agreements have an overnight and continuous maturity date.

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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, before effects of master netting arrangements, of funds outstanding borrowed in the form of a financial asset repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same financial asset at a date certain for a specified price. Includes repurchase-to-maturity transactions and liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 7 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL34722452-111729 + Details
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