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RELATED-PARTY TRANSACTIONS - Transactions with St. Cloud Affiliates (Details) - USD ($) | Nov. 24, 2014 | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 14, 2012
--- | --- | --- | --- | --- | ---
Related Party Transaction [Line Items] |  |  |  |  |
Deposits |  | $ 7,403,593,000 | $ 9,142,150,000 |  |
Limited Liability Company |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  | 700,538
Percentage of total shares outstanding |  |  |  | 1.40% |
Limited partnership, required ownership interest (less than) | 9.90% |  |  |  |
Deposits |  | $ 0 | $ 1,000 |  |
Limited Liability Company | Minimum |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Limited partnership, expected investment | $ 5,000,000 |  |  |  |
Limited Liability Company | Maximum |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Limited partnership, expected investment | $ 7,500,000 |  |  |  |

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