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OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components of accumulated other comprehensive income (loss), net of tax [Abstract]      
Net unrealized gain on securities available for sale $ (340) $ 1,979  
Tax effect 71 (673)  
Net -of-tax amount (269) 1,306  
Unrecognized pension costs (3,961) (4,088)  
Tax effect 832 1,390  
Net -of-tax amount (3,129) (2,698)  
Total accumulated other comprehensive income (3,398) (1,392)  
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance 123,268 119,760 $ 100,528
Other comprehensive income (loss) before reclassifications (net of tax) (912) (1,133) (855)
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax) (535) (23) (148)
Net other comprehensive income (1,447) (1,156) (1,003)
Change in other comprehensive income due to change in the federal tax rate 0    
Balance 129,011 123,268 119,760
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance (1,392) (236) 767
Net other comprehensive income (1,447) (1,156) (1,003)
Change in other comprehensive income due to change in the federal tax rate (559)    
Balance (3,398) (1,392) (236)
Unrealized Gains (Loss) on Available For Sale Securities [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance [1] 1,306 2,204 3,093
Other comprehensive income (loss) before reclassifications (net of tax) [1] (847) (730) (606)
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax) [1] (683) (168) (283)
Net other comprehensive income [1] (1,530) (898) (889)
Change in other comprehensive income due to change in the federal tax rate [1] (45)    
Balance [1] (269) 1,306 2,204
Defined Benefit Pension Items [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance [1] (2,698) (2,440) (2,326)
Other comprehensive income (loss) before reclassifications (net of tax) [1] (65) (403) (249)
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax) [1] 148 145 135
Net other comprehensive income [1] 83 (258) (114)
Change in other comprehensive income due to change in the federal tax rate [1] (514)    
Balance [1] $ (3,129) $ (2,698) $ (2,440)
[1] Amounts in parentheses indicate debits on the consolidated balance sheet.