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	Sep. 30, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Increase is bank-owned life insurance	$ 30,000	$ 50,000
Bank owned life insurance						$ 101,909	$ 100,171
Tier 1 risk based capital including future event						10.10%
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			3,100,564
Ownership percentage				9.30%			8.20%
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