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INVESTMENTS - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2018
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |
Realized gain (loss) on debt securities transferred from HTM to AFS |  | $ 200 |  |  |  |
NumberOfSecuritiesInSecurityPortfolio | 1,347 |  |  | 1,347 |  | 1,417
NumberOfSecuritiesInUnrealizedLossPosition | 177 |  |  | 177 |  | 504
Proceeds from Sale of Debt Securities, Available-for-sale | $ 115,640 |  | $ 216,197 | $ 115,600 | $ 216,200 |
Available-for-sale Securities, Gross Realized Gains | 684 |  | 0 | 700 |  |
Available-for-sale Securities, Gross Realized Losses | $ 720 |  | 30 | $ 700 |  |
Debt Securities, Held-to-maturity, Transfer, Amount |  | $ 268,700 | $ 367,900 |  |  |

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