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SECURITIES AVAILABLE FOR SALE - Proceeds from Sales of AFS Securities and Gross Gains and Gross Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Proceeds from sale of AFS securities | $ 25,533 | $ 23,581 | $ 88,110 | $ 58,653 |
Gross gains | 211 | 654 | 1,052 | 807 |
Gross losses | 165 | $ 0 | 190 | $ 150 |
Collateral Pledged |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
AFS securities pledged to secure public funds, fair value | $ 258,043 |  | $ 258,043 |  | $ 319,907

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