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INVESTMENTS INVESTMENTS - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017
Gain (Loss) on Securities [Line Items] |  |  |  |  |
NumberOfSecuritiesInSecurityPortfolio | 1,414 |  | 1,414 |  | 775
NumberOfSecuritiesInUnrealizedLossPosition | 909 |  | 909 |  | 237
Proceeds from Sale of Debt Securities, Available-for-sale | $ 43,322 | $ 53,900 | $ 259,500 | $ 179,600 |
Available-for-sale Securities, Gross Realized Gains | 267 | 400 | 270 | 1,800 |
Available-for-sale Securities, Gross Realized Losses | $ 434 | $ 100 | 467 | $ 200 |
Debt Securities, Held-to-maturity, Transfer, Amount |  |  | $ 367,900 |  |

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