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INVESTMENTS INVESTMENTS - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017
Gain (Loss) on Investments [Line Items] |  |  |  |  |
NumberOfSecuritiesInSecurityPortfolio | 1,385 |  | 1,385 |  | 775
NumberOfSecuritiesInUnrealizedLossPosition | 656 |  | 656 |  | 237
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds | $ 216,196 | $ 103,400 | $ 216,200 | $ 125,600 |
Held-to-maturity Securities, Transferred Security, at Carrying Value | 367,900 |  | 367,900 |  |
Available-for-sale Securities, Gross Realized Gains | 3 | 1,000 | 3 | 1,500 |
Available-for-sale Securities, Gross Realized Losses | $ 33 | $ 100 | $ 33 | $ 100 |

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