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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 | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Proceeds from sale of AFS securities | $ 25,070 | $ 103,666 | $ 113,180 | $ 162,319 |
Gross gains | 185 | 670 | 1,237 | 1,477 |
Gross losses | 156 | $ 137 | 346 | $ 287 |
Collateral Pledged |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
AFS securities pledged to secure public funds, fair value | $ 297,469 |  | $ 297,469 |  | $ 319,907

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