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INVESTMENTS - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018
Gain (Loss) on Securities [Line Items] |  |  |  |  |  |  |
Realized gain (loss) on debt securities transferred from HTM to AFS |  | $ 0.2 |  |  |  |  |
NumberOfSecuritiesInSecurityPortfolio | 1,284 |  |  |  | 1,284 |  | 1,417
NumberOfSecuritiesInUnrealizedLossPosition | 119 |  |  |  | 119 |  | 504
Proceeds from Sale of Debt Securities, Available-for-sale | $ 284.9 |  | $ 43.3 |  | $ 400.5 | $ 259.5 |
Available-for-sale Securities, Gross Realized Gains | 1.2 |  | 0.3 |  | 1.9 | 0.3 |
Available-for-sale Securities, Gross Realized Losses | $ 1.1 |  | $ 0.4 |  | $ 1.8 | $ 0.5 |
Debt Securities, Held-to-maturity, Transfer, Amount |  | $ 268.7 |  | $ 367.9 |  |  |

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