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ACCUMULATED OTHER COMPREHENSIVE INCOME OR LOSS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Summary of changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]      
Beginning Balances $ 137,242 $ 133,628 $ 138,578
Total other comprehensive income (loss) 188 (2,157) (8,940)
Ending Balances 143,748 137,242 133,628
Net gains on securities transactions 987 372 6,869
Pension and other employee benefits 6,132 5,908 5,733
Income tax expense 4,404 4,658 3,709
Net of tax 10,027 9,433 8,157
Reclassification out of Accumulated Other Comprehensive Income (loss)      
Summary of changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]      
Net of tax 799 631 (3,865)
Unrealized Gains and Losses on Securities Available for Sale      
Summary of changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]      
Beginning Balances 210 1,960 6,043
Other comprehensive income (loss) before reclassification (3,952) (1,520) 146
Amounts reclassified from accumulated other comprehensive income (loss) (614) (230) (4,229)
Total other comprehensive income (loss) (4,566) (1,750) (4,083)
Ending Balances (4,356) 210 1,960
Unrealized Gains and Losses on Securities Available for Sale | Reclassification out of Accumulated Other Comprehensive Income (loss)      
Summary of changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]      
Net gains on securities transactions (987) (372) (6,869)
Income tax expense 373 142 2,640
Net of tax (614) (230) (4,229)
Defined Benefit and Other Benefit Plans      
Summary of changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]      
Beginning Balances (11,152) (10,745) (5,888)
Other comprehensive income (loss) before reclassification 3,341 (1,268) (5,221)
Amounts reclassified from accumulated other comprehensive income (loss) 1,413 861 364
Total other comprehensive income (loss) 4,754 (407) (4,857)
Ending Balances (6,398) (11,152) (10,745)
Defined Benefit and Other Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income (loss)      
Summary of changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]      
Income tax expense (856) (533) (227)
Net of tax 1,413 861 364
Net Prior Service Cost (Credit) | Reclassification out of Accumulated Other Comprehensive Income (loss)      
Summary of changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]      
Pension and other employee benefits 674 (90) (90)
Net Unamortized Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income (loss)      
Summary of changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]      
Pension and other employee benefits 1,595 1,484 681
Accumulated Other Comprehensive Income (Loss)      
Summary of changes in accumulated other comprehensive income or loss by component, net of tax [Roll Forward]      
Beginning Balances (10,942) (8,785) 155
Other comprehensive income (loss) before reclassification (611) (2,788) (5,075)
Amounts reclassified from accumulated other comprehensive income (loss) 799 631 (3,865)
Total other comprehensive income (loss) 188 (2,157) (8,940)
Ending Balances $ (10,754) $ (10,942) $ (8,785)