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STOCKHOLDERS' EQUITY - Preferred Stock (Details) - Preferred Stock - USD ($) $ / shares in Units, $ in Millions |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 23, 2019 | Sep. 17, 2018 | Sep. 30, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |
Payment for redemption of shares |  | $ 40.3 |  |
Series C 8.00% non-cumulative perpetual |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares redeemed (in shares) |  | 40,250 |  |
Non cumulative preferred stock, dividend rate |  | 8.00% |  |
Liquidation amount (in usd per share) |  | $ 1,000 |  |
Series C Depository Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares redeemed (in shares) |  | 1,610,000 |  |
Liquidation amount (in usd per share) |  | $ 25 |  |
Interest in Series C Preferred Stock represented by each redeemed share (percent) |  | 2.50% |  |
Deferred issuance costs reclassified to retained earnings |  | $ 2.3 |  |
Series D Depository Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares redeemed (in shares) | 734,823 |  |  |
Liquidation amount (in usd per share) | $ 1,000 |  |  |
Interest in Series C Preferred Stock represented by each redeemed share (percent) | 2.50% |  |  |
Payment for redemption of shares | $ 19.4 |  |  |
Series D Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares redeemed (in shares) | 18,371 |  |  |
Non cumulative preferred stock, dividend rate |  |  | 7.375% | 7.375%
Deferred issuance costs reclassified to retained earnings | $ 1.7 |  |  |
Series E Depository Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares redeemed (in shares) | 980,928 |  |  |
Liquidation amount (in usd per share) | $ 1,000 |  |  |
Interest in Series C Preferred Stock represented by each redeemed share (percent) | 2.50% |  |  |
Payment for redemption of shares | $ 26.6 |  |  |
Series E Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares redeemed (in shares) | 24,523 |  |  |
Non cumulative preferred stock, dividend rate |  |  | 7.00% | 7.00%
Deferred issuance costs reclassified to retained earnings | $ 3.4 |  |  |

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