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RELATED-PARTY TRANSACTIONS - Transactions with TWC Shared Opportunity Fund V, L.P., a Greater than 5 percent Shareholder (Details) |  |  |  |  |  |  | 1 Months Ended |  |  |  |  |
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Aug. 03, 2015 $ / shares shares | Mar. 16, 2015 shares | Jan. 20, 2015 shares | Jan. 05, 2015 shares | Jun. 03, 2013 shares | Nov. 01, 2010 $ / shares shares | Nov. 30, 2010 shares | Sep. 30, 2017 $ / shares | Dec. 31, 2015 shares | Dec. 31, 2014 shares | Dec. 10, 2014 | May 29, 2013
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants for non-voting common stock (in dollars per share) | $ / shares |  |  |  |  |  | $ 11 |  | $ 8.55 |  |  |  |
TCW Shared Opportunity Fund |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Warrant exercisable period |  |  |  |  |  | 5 years | 5 years |  |  |  |  |
Warrants issued (in shares) |  |  |  |  |  | 240,000 | 240,000 |  |  | 240,000 |  |
Conversion ratio |  |  |  |  |  |  |  |  |  |  | 1 |
Exercise price of warrants for non-voting common stock (in dollars per share) | $ / shares | $ 9.13 |  |  |  |  | $ 11.00 |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  | 3.50% |  |  |
TCW Shared Opportunity Fund | Voting Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum ownership percentage by noncontrolling owners to not be considered a bank holding company |  |  |  |  |  |  | 4.99% |  |  |  |  |
Maximum ownership percentage |  |  |  |  |  |  |  |  |  |  |  | 9.99%
Shares outstanding (in shares) |  |  |  |  |  |  |  |  |  | 1,318,462 |  |
Shares exchanged (in shares) |  | 934 | 86,620 | 522,564 | 550,000 |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  | 1,318,462 |  |  |
TCW Shared Opportunity Fund | Voting Common Stock | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares of voting common stock (in shares) | 70,690 |  |  |  |  |  |  |  |  |  |  |
TCW Shared Opportunity Fund | Nonvoting Common Stock | Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance of shares of voting common stock (in shares) | 70,690 |  |  |  |  |  |  |  |  |  |  |

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