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Derivative Financial Instruments Fair Value Option (Details) - Mortgage loans held for sale - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Mortgage Banking Income |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value Gain (Loss) | $ 472 | $ (313)
Mortgage loans held for sale |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Cost | 31,069 | 28,708
Fair Value | $ 31,530 | $ 28,697

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- Definition Contractual Principal Outstanding Mortgage Loand Held For Sale + References No definition available. + Details
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Balance Type: | debit
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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + 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 Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References No definition available. + Details
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- Details
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