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STOCKHOLDERS' EQUITY - Preferred Stock (Details) - Preferred Stock - USD ($) $ / shares in Units, $ in Millions |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 17, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |
Preferred stock, authorized (in shares) |  | 240,000,000 | 280,250,000
Preferred stock, par value (in dollars per share) |  | $ 0.01 |
Preferred stock, liquidation preference per share (in dollars per share) |  | $ 1,000 |
Payment for redemption of shares | $ 40.3 |  |
Series C 8.00% non-cumulative perpetual |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, authorized (in shares) |  | 0 | 40,250,000
Shares redeemed | 40,250 |  |
Non cumulative preferred stock, dividend rate |  | 8.00% | 8.00%
Liquidation amount (in usd per share) | $ 1,000 |  |
Series C Depository Shares |  |  |
Class of Stock [Line Items] |  |  |
Shares redeemed | 1,610,000 |  |
Liquidation amount (in usd per share) | $ 25.00 |  |
Deferred issuance costs reclassified to retained earnings | $ 2.3 |  |
Maximum |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, authorized (in shares) |  | 50,000,000 |

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