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SECURITIES AVAILABLE FOR SALE - Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Investments, Debt and Equity Securities [Abstract] |  |
AFS securities pledged as collateral | $ 319,907 | $ 317,282

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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 + Details
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- References No definition available. + Details
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