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SECURITIES - Securitites held to maturity (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Amortized cost and estimated fair value of securities held to maturity [Abstract]    
Amortized Cost $ 4,705,000 $ 4,566,000
Estimated Fair Value 4,912,000 4,822,000
Unrealized Gains 207,000 256,000
Unrealized Losses 0 0
Amortized Cost    
Within one year 1,742,000  
After one, but within five years 2,626,000  
After five, but within ten years 337,000  
After ten years 0  
Total 4,705,000 4,566,000
Fair Value    
Within one year 1,754,000  
After one, but within five years 2,780,000  
After five, but within ten years 378,000  
After ten years 0  
Total 4,912,000 4,822,000
Gain (loss) on sale of held-to-maturity securities 0 0
Obligations of states and political subdivisions    
Amortized cost and estimated fair value of securities held to maturity [Abstract]    
Amortized Cost 3,725,000 4,566,000
Estimated Fair Value 3,931,000 4,822,000
Unrealized Gains 206,000 256,000
Unrealized Losses 0 0
Amortized Cost    
Total 3,725,000 4,566,000
Fair Value    
Total 3,931,000 4,822,000
Time deposits with other financial institutions    
Amortized cost and estimated fair value of securities held to maturity [Abstract]    
Amortized Cost 980,000 0
Estimated Fair Value 981,000 0
Unrealized Gains 1,000 0
Unrealized Losses 0 0
Amortized Cost    
Total 980,000 0
Fair Value    
Total $ 981,000 $ 0