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STOCKHOLDERS' EQUITY - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 23, 2019 | Sep. 17, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Series D 7.375% non-cumulative perpetual |  |  |  |
Class of Stock [Line Items] |  |  |  |
Depository shares to preferred stock ratio | 2.50% |  |  |
Series E 7.00% non-cumulative perpetual |  |  |  |
Class of Stock [Line Items] |  |  |  |
Depository shares to preferred stock ratio | 2.50% |  |  |
Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, authorized (in shares) |  |  | 197,106 | 240,000
Preferred stock, par value (in dollars per share) |  |  | $ 0.01 |
Preferred stock, liquidation preference per share (in dollars per share) |  |  | $ 1,000 |
Aggregate amount of redemption |  | $ 40.3 |  |
Preferred Stock | Series D Depository shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Outstanding shares redeemed (shares) | 734,823 |  |  |
Redemption price ( in dollars per share) | $ 1,000 |  |  |
Aggregate amount of redemption | $ 19.4 |  |  |
Preferred Stock | Series D 7.375% non-cumulative perpetual |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, authorized (in shares) |  |  | 96,629 |
Outstanding shares redeemed (shares) | 18,371 |  |  |
Stock issuance cost | $ 1.7 |  |  |
Non cumulative preferred stock, dividend rate (percent) |  |  | 7.375% | 7.375%
Preferred Stock | Series E Depository shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Outstanding shares redeemed (shares) | 980,928 |  |  |
Redemption price ( in dollars per share) | $ 1,000 |  |  |
Aggregate amount of redemption | $ 26.6 |  |  |
Preferred Stock | Series E 7.00% non-cumulative perpetual |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, authorized (in shares) |  |  | 100,477 |
Outstanding shares redeemed (shares) | 24,523 |  |  |
Stock issuance cost | $ 3.4 |  |  |
Non cumulative preferred stock, dividend rate (percent) |  |  | 7.00% | 7.00%
Preferred Stock | Series C Depository shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Outstanding shares redeemed (shares) |  | 1,610,000 |  |
Redemption price ( in dollars per share) |  | $ 25 |  |
Stock issuance cost |  | $ 2.3 |  |
Preferred Stock | Series C 8.00% non-cumulative perpetual |  |  |  |
Class of Stock [Line Items] |  |  |  |
Outstanding shares redeemed (shares) |  | 40,250 |  |
Redemption price ( in dollars per share) |  | $ 1,000 |  |
Non cumulative preferred stock, dividend rate (percent) |  | 8.00% |  |
Maximum | Preferred Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, authorized (in shares) |  |  | 50,000,000 |

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