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INVESTMENT SECURITIES - Narrative (Details) $ in Millions | Dec. 31, 2017 USD ($) Securities | Dec. 31, 2016 USD ($)
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Investments, Debt and Equity Securities [Abstract] |  |
Securities pledged to secure public deposits | $ | $ 328.1 | $ 332.7
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities and Held-to-maturity investments in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total | 532 |
Available-for-sale Securities and Held-To-Maturity, Continuous Unrealized Loss Position, Accumulated Loss | $ | $ 4.6 |
Ginnie Mae mortgage-backed securities (GNMA), U.S. Treasuries, or SBA securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities and Held-to-maturity investments in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total | 159 |
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities and Held-to-maturity investments in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Total | 67 |

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale and held-to-maturity in a continuous loss position. + References No definition available. + Details
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- Definition Number of investment positions in available-for-sale and held-to-maturity investments that have been in a unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
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- Definition The carrying amount (fair value) as of the balance sheet date of securities held that had been pledged by counterparties under financing and lending arrangements, pursuant to which the entity has the right by agreement or custom to sell or re-pledge such securities. + 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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