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RELATED-PARTY TRANSACTIONS - Securities Purchase Agreement with Patriot Financial Partners, L.P. and Patriot Financial Partners Parallel, L.P. (Details) | Oct. 30, 2014 USD ($) $ / shares shares | Jun. 30, 2015 shares | Dec. 31, 2014 shares | Nov. 10, 2014 shares | Nov. 08, 2014 Branch | Apr. 22, 2014 Branch
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Banco Popular Branches |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Number of branches | Branch |  |  |  |  | 20 |
Class A Common Stock |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Common stock, shares outstanding |  | 35,647,476 | 34,190,740 |  |  |
Greater Than 5% Shareholder, Patriot [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Aggregate purchase price | $ | $ 20,040,480 |  |  |  |  |
Equity support payment | $ | 538,000 |  |  |  |  |
Greater Than 5% Shareholder, Patriot [Member] | Securities Purchase Agreement, Reimbursement of Out-of-Pocket Expenses |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Expenses from transactions with related parties | $ | $ 100,000 |  |  |  |  |
Greater Than 5% Shareholder, Patriot [Member] | Banco Popular Branches |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Number of branches | Branch |  |  |  |  |  | 20
Greater Than 5% Shareholder, Patriot [Member] | Class A Common Stock |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Common stock, shares outstanding |  |  |  | 3,100,564 |  |
Greater Than 5% Shareholder, Patriot [Member] | Class A Common Stock | Voting Common Stock Option One |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Common stock issuable | 1,076,000 |  |  |  |  |
Price per share issuable | $ / shares | $ 9.78 |  |  |  |  |
Greater Than 5% Shareholder, Patriot [Member] | Class A Common Stock | Voting Common Stock Option Two |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Common stock issuable | 824,000 |  |  |  |  |
Price per share issuable | $ / shares | $ 11.55 |  |  |  |  |

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