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RELATED-PARTY TRANSACTIONS - Transactions with Patriot Affiliates (Details) $ / shares in Units, $ in Thousands	Nov. 07, 2014 USD ($) shares	Oct. 30, 2014 USD ($) $ / shares shares	Dec. 06, 2018 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		1,461,945
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

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