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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net unrealized gains/losses on investment securities, Before Tax      
Net unrealized gains/(losses) arising during the period $ (838) $ (7,397) $ (9,184)
Less: Reclassification adjustment for losses realized in net income 1,410 0 1,866
Net unrealized gains/(losses) on investment securities 572 (7,397) (7,318)
Defined benefit plans, Before Tax      
Net actuarial gains/losses arising during the period (1,318) (963) 687
Other comprehensive income (loss) 721 (2,879) (4,909)
Net unrealized gains/losses on investment securities, Tax Effect      
Net unrealized gains/losses arising during the period (333) (2,945) (3,655)
Less: Reclassification adjustment for gains/losses realized in net income 561 0 742
Net unrealized gains (losses) on investment securities 228 (2,945) (2,913)
Defined benefit plans, Tax Effect      
Net actuarial gains/losses arising during the period (518) (385) 274
Other comprehensive income (loss) 239 (1,155) (1,953)
Net unrealized gains/losses on investment securities, Net of Tax      
Net unrealized gains/losses arising during the period (505) (4,452) (5,529)
Less: Reclassification adjustment for gains/losses realized in net income 849 0 1,124
Net unrealized gains (losses) on investment securities 344 (4,452) (4,405)
Defined benefit plans, Net of Tax      
Net actuarial gains/losses arising during the period (800) (578) 413
Amounts reclassified from AOCI 1,787 3,306 2,160
Total other comprehensive income (loss), net of tax 482 (1,724) (2,956)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]      
Defined benefit plans, Before Tax      
Amortization of net transition obligation 1,293 1,599 1,688
Defined benefit plans, Tax Effect      
Amortization of net transition obligation 460 634 672
Defined benefit plans, Net of Tax      
Amounts reclassified from AOCI 833 965 1,016
Accumulated Defined Benefit Plans Adjustment, Net Transition Attributable to Parent [Member]      
Defined benefit plans, Before Tax      
Amortization of net transition obligation 18 17 16
Defined benefit plans, Tax Effect      
Amortization of net transition obligation 7 6 7
Defined benefit plans, Net of Tax      
Amounts reclassified from AOCI 11 11 9
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]      
Defined benefit plans, Before Tax      
Amortization of net transition obligation 18 18 18
Defined benefit plans, Tax Effect      
Amortization of net transition obligation 7 7 7
Defined benefit plans, Net of Tax      
Amounts reclassified from AOCI 11 11 11
Accumulated Defined Benefit Plans, Settlement Attributable to Parent [Member]      
Defined benefit plans, Before Tax      
Amortization of net transition obligation 138 3,847  
Defined benefit plans, Tax Effect      
Amortization of net transition obligation 55 1,528  
Defined benefit plans, Net of Tax      
Amounts reclassified from AOCI 83 2,319  
Defined Benefit Plans      
Defined benefit plans, Before Tax      
Other comprehensive income (loss) (149) (4,518) (2,409)
Defined benefit plans, Tax Effect      
Other comprehensive income (loss) (11) (1,790) (960)
Defined benefit plans, Net of Tax      
Amounts reclassified from AOCI 938 3,306 1,036
Total other comprehensive income (loss), net of tax $ 138 $ 2,728 $ 1,449