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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net unrealized gains/losses on investment securities, Before Tax      
Net unrealized gains/(losses) arising during the period $ (19,063) $ (838) $ (7,397)
Less: Reclassification adjustment for losses realized in net income (279) 1,410 0
Net unrealized gains/(losses) on investment securities (19,342) 572 (7,397)
Defined benefit plans, Before Tax      
Net actuarial gains/losses arising during the period 264 (1,318) (963)
Other comprehensive income (loss) (17,889) 721 (2,879)
Net unrealized gains/losses on investment securities, Tax Effect      
Net unrealized gains/losses arising during the period (5,145) (333) (2,945)
Less: Reclassification adjustment for gains/losses realized in net income (75) 561 0
Net unrealized gains (losses) on investment securities (5,220) 228 (2,945)
Defined benefit plans, Tax Effect      
Net actuarial gains/losses arising during the period 71 (518) (385)
Other comprehensive income (loss) (4,810) 239 (1,155)
Net unrealized gains/losses on investment securities, Net of Tax      
Net unrealized gains/losses arising during the period (13,918) (505) (4,452)
Less: Reclassification adjustment for gains/losses realized in net income (204) 849 0
Net unrealized gains (losses) on investment securities (14,122) 344 (4,452)
Defined benefit plans, Net of Tax      
Net actuarial gains/losses arising during the period 193 (800) (578)
Amounts reclassified from AOCI 646 1,787 3,306
Total other comprehensive income (loss), net of tax (13,079) 482 (1,724)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]      
Defined benefit plans, Before Tax      
Amortization of net transition obligation 1,153 1,293 1,599
Defined benefit plans, Tax Effect      
Amortization of net transition obligation 329 460 634
Defined benefit plans, Net of Tax      
Amounts reclassified from AOCI 824 833 965
Accumulated Defined Benefit Plans Adjustment, Net Transition Attributable to Parent [Member]      
Defined benefit plans, Before Tax      
Amortization of net transition obligation 18 18 17
Defined benefit plans, Tax Effect      
Amortization of net transition obligation 5 7 6
Defined benefit plans, Net of Tax      
Amounts reclassified from AOCI 13 11 11
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 5 7 7
Defined benefit plans, Net of Tax      
Amounts reclassified from AOCI 13 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) (1,453) (149) (4,518)
Defined benefit plans, Tax Effect      
Other comprehensive income (loss) (410) (11) (1,790)
Defined benefit plans, Net of Tax      
Amounts reclassified from AOCI 850 938 3,306
Total other comprehensive income (loss), net of tax $ 1,043 $ 138 $ 2,728