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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |  |  |
Income tax expense related to net securities gains | $ 489 |  |  | $ 6 | $ 994 | $ 187
Tax benefit due to a change in tax law, treatment of acquired life insurance assets |  |  | $ 185 |  |  |
Income tax benefit | $ (1,340) |  |  | $ (644) | $ (1,682) | $ (1,510)
Hamilton Bancorp, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Income tax benefit |  | $ 334 |  |  |  |

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