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Securities Available for Sale (Details 1) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Proceeds from sales of available-for-sale securities and the associated gains and losses |  |  |
Proceeds | $ 54,497 | $ 11,493 | $ 102,257
Gross gains | 727 | 389 | 908
Gross losses | $ (723) | $ (316) | $ (814)

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- Definition This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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