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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net unrealized gains/losses on investment securities, Before Tax      
Net unrealized gains/(losses) arising during the period $ (41,237) $ 15,939 $ 37,696
Add: Reclassification adjustment for gains realized in net income (150) 201 (36)
Net unrealized gains/(losses) on investment securities (41,387) 16,140 37,660
Defined benefit plans, Before Tax      
Net actuarial gains/losses arising during the period 2,014 (1,488) (1,106)
Other comprehensive income (loss) (38,319) 15,844 37,707
Net unrealized gains/losses on investment securities, Tax Effect      
Net unrealized gains/losses arising during the period (11,030) 4,260 10,102
Less: Reclassification adjustment for gains/losses realized in net income (40) 54 (10)
Net unrealized gains (losses) on investment securities (11,070) 4,314 10,092
Defined benefit plans, Tax Effect      
Net actuarial gains/losses arising during the period 544 (508) (296)
Other comprehensive income (loss) (10,231) 4,125 10,105
Net unrealized gains/losses on investment securities, Net of Tax      
Net unrealized gains/losses arising during the period (30,207) 11,679 27,594
Less: Reclassification adjustment for gains/losses realized in net income (110) 147 (26)
Net unrealized gains (losses) on investment securities (30,317) 11,826 27,568
Defined benefit plans, Net of Tax      
Net actuarial gains/losses arising during the period 1,470 (980) (810)
Total other comprehensive income (loss), net of tax (28,088) 11,719 27,602
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]      
Defined benefit plans, Before Tax      
Amortization of net transition obligation 1,036 1,160 1,117
Defined benefit plans, Tax Effect      
Amortization of net transition obligation 291 310 299
Defined benefit plans, Net of Tax      
Amounts reclassified from AOCI 745 850 818
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 4 5 5
Defined benefit plans, Net of Tax      
Amounts reclassified from AOCI 14 13 13
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]      
Defined benefit plans, Before Tax      
Amortization of net transition obligation 0 14 18
Defined benefit plans, Tax Effect      
Amortization of net transition obligation 0 4 5
Defined benefit plans, Net of Tax      
Amounts reclassified from AOCI 0 10 13
Defined Benefit Plans      
Defined benefit plans, Before Tax      
Other comprehensive income (loss) (3,068) 296 (47)
Defined benefit plans, Tax Effect      
Other comprehensive income (loss) (839) 189 (13)
Defined benefit plans, Net of Tax      
Amounts reclassified from AOCI 759 873 844
Total other comprehensive income (loss), net of tax $ 2,229 $ (107) $ 34