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RELATED-PARTY TRANSACTIONS - Transactions with Patriot Affiliates (Details) - USD ($)
$ / shares in Units, $ in Thousands
Sep. 15, 2015
Jul. 14, 2015
Apr. 06, 2015
Nov. 07, 2014
Oct. 30, 2014
Mar. 31, 2017
Feb. 24, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]                
Increase is bank-owned life insurance $ 30,000 $ 50,000            
Bank owned life insurance           $ 103,093   $ 102,512
Tier 1 risk based capital including future event           9.90%    
Expenses from transactions with related parties     $ 263          
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)       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)         1,076,000      
Price per share issuable         $ 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)         824,000      
Price per share issuable         $ 11.55