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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net unrealized gains/losses on investment securities, Before Tax      
Net unrealized gains/(losses) arising during the period $ 37,696 $ (19,063) $ (838)
Less: Reclassification adjustment for losses realized in net income (36) (279) 1,410
Net unrealized gains/(losses) on investment securities 37,660 (19,342) 572
Defined benefit plans, Before Tax      
Net actuarial gains/losses arising during the period (1,106) 264 (1,318)
Other comprehensive income (loss) 37,707 (17,889) 721
Net unrealized gains/losses on investment securities, Tax Effect      
Net unrealized gains/losses arising during the period 10,102 (5,145) (333)
Less: Reclassification adjustment for gains/losses realized in net income (10) (75) 561
Net unrealized gains (losses) on investment securities 10,092 (5,220) 228
Defined benefit plans, Tax Effect      
Net actuarial gains/losses arising during the period (296) 71 (518)
Other comprehensive income (loss) 10,105 (4,810) 239
Net unrealized gains/losses on investment securities, Net of Tax      
Net unrealized gains/losses arising during the period 27,594 (13,918) (505)
Less: Reclassification adjustment for gains/losses realized in net income (26) (204) 849
Net unrealized gains (losses) on investment securities 27,568 (14,122) 344
Defined benefit plans, Net of Tax      
Net actuarial gains/losses arising during the period (810) 193 (800)
Amounts reclassified from AOCI 818   1,787
Total other comprehensive income (loss), net of tax 27,602 (13,079) 482
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]      
Defined benefit plans, Before Tax      
Amortization of net transition obligation 1,117 1,153 1,293
Defined benefit plans, Tax Effect      
Amortization of net transition obligation 299 329 460
Defined benefit plans, Net of Tax      
Amounts reclassified from AOCI 818 824 833
Accumulated Defined Benefit Plans Adjustment, Net Transition 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 5 7
Defined benefit plans, Net of Tax      
Amounts reclassified from AOCI 13 13 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 5 7
Defined benefit plans, Net of Tax      
Amounts reclassified from AOCI 13 13 11
Accumulated Defined Benefit Plans, Settlement Attributable to Parent [Member]      
Defined benefit plans, Before Tax      
Amortization of net transition obligation     138
Defined benefit plans, Tax Effect      
Amortization of net transition obligation     55
Defined benefit plans, Net of Tax      
Amounts reclassified from AOCI     83
Defined Benefit Plans      
Defined benefit plans, Before Tax      
Other comprehensive income (loss) (47) (1,453) (149)
Defined benefit plans, Tax Effect      
Other comprehensive income (loss) (13) (410) (11)
Defined benefit plans, Net of Tax      
Amounts reclassified from AOCI 844 850 938
Total other comprehensive income (loss), net of tax $ 34 $ 1,043 $ 138