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RELATED-PARTY TRANSACTIONS - Transactions with Patriot Affiliates (Details) $ / shares in Units, $ in Thousands |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 07, 2014 USD ($) shares | Oct. 30, 2014 USD ($) $ / shares shares | Sep. 30, 2018 | Feb. 24, 2017 shares | Nov. 08, 2014 Branch
Banco Popular North America (BPNA) |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Number of branches | Branch |  |  |  |  | 20
Greater Than 5% Shareholder, Patriot |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Aggregate purchase price | $ |  | $ 20,000 |  |  |
Greater Than 5% Shareholder, Patriot | Equity Support Payment |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Expenses from transactions with related parties | $ | $ 538 |  |  |  |
Greater Than 5% Shareholder, Patriot | Reimbursement of Out-of-Pocket Expenses |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Expenses from transactions with related parties | $ | $ 100 |  |  |  |
Greater Than 5% Shareholder, Patriot | Voting Common Stock |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Common stock, shares outstanding (in shares) | shares | 3,100,564 |  |  | 2,850,564 |
Ownership percentage | 9.30% |  |  |  |
Greater Than 5% Shareholder, Patriot | Voting Common Stock | Voting Common Stock Option One |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Common stock issuable (in shares) | shares |  | 1,076,000 |  |  |
Price per share issuable (in dollars per share) | $ / shares |  | $ 9.78 |  |  |
Greater Than 5% Shareholder, Patriot | Voting Common Stock | Voting Common Stock Option Two |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Common stock issuable (in shares) | shares |  | 824,000 |  |  |
Price per share issuable (in dollars per share) | $ / shares |  | $ 11.55 |  |  |
Director | W. Kirk Wycoff |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Service term |  |  | 1 year |  |

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