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RELATED-PARTY TRANSACTIONS - Transactions with Patriot Affiliates (Details)
$ / shares in Units, $ in Thousands
Apr. 06, 2015
USD ($)
Nov. 07, 2014
USD ($)
shares
Oct. 30, 2014
USD ($)
$ / shares
shares
Feb. 24, 2017
shares
Nov. 08, 2014
Branch
Related Party Transaction [Line Items]          
Expenses from transactions with related parties $ 263        
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