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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Common Shares (Details) - $ / shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Common Share (EPS)    
Weighted average common shares outstanding 2,018,649 2,018,253
Dilutive effect of stock options   338
Weighted average common and common equivalent shares outstanding 2,018,649 2,018,591
Stock Options.    
Anti-dilutive securities    
Outstanding options to purchase shares of common stock not included, anti-dilutive 11,418 8,500
Weighted average exercise price of options, anti-dilutive (in dollars per share) $ 15.99 $ 17.16
Options not included in weighted average common shares outstanding 4,750  
Weighted average exercise price of options not included in weighted average common shares outstanding (in dollars per share) $ 10.58