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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net unrealized gains/losses on investment securities, Before Tax      
Less: Amortization of unrealized losses on investment securities transferred to HTM $ (4,295) $ 0 $ 0
Other Comprehensive Income (Loss), before Tax (184,493) (38,319) 15,844
Defined benefit plans, Before Tax      
Net actuarial gains arising during the period 2,007 2,014 1,488
Settlement 4,884    
Net unrealized gains/losses on investment securities, Tax Effect      
Other Comprehensive Income (Loss), Tax (48,469) (10,231) 4,125
Defined benefit plans, Tax Effect      
Net actuarial gains arising during the period 537 544 508
Settlement 1,817    
Net unrealized gains/losses on investment securities, Net of Tax      
Net unrealized gains (losses) on investment securities (145,443) (30,317) 11,826
Total other comprehensive (loss) income, net of tax (136,024) (28,088) 11,719
Defined benefit plans, Net of Tax      
Net actuarial gains/losses arising during the period 1,470 1,470 980
Settlement 3,067    
Amortization of net actuarial losses      
Defined benefit plans, Before Tax      
Amortization 304 1,036 (1,160)
Defined benefit plans, Tax Effect      
Amortization 81 291 (310)
Defined benefit plans, Net of Tax      
Amortization 223 745 (850)
Amortization of net transition obligation      
Defined benefit plans, Before Tax      
Amortization 18 18 (18)
Defined benefit plans, Tax Effect      
Amortization 4 4 (5)
Defined benefit plans, Net of Tax      
Amortization 14 14 (13)
Amortization of prior service cost      
Defined benefit plans, Before Tax      
Amortization     (14)
Defined benefit plans, Tax Effect      
Amortization     (4)
Defined benefit plans, Net of Tax      
Amortization     (10)
Defined Benefit Plans      
Net unrealized gains/losses on investment securities, Before Tax      
Other Comprehensive Income (Loss), before Tax 7,213 3,068 296
Net unrealized gains/losses on investment securities, Tax Effect      
Other Comprehensive Income (Loss), Tax 2,439 839 189
Net unrealized gains/losses on investment securities, Net of Tax      
Other comprehensive (loss) income before reclassifications 1,470 1,470 (980)
Total other comprehensive (loss) income, net of tax 4,774 2,229 (107)
Defined benefit plans, Net of Tax      
Amortization (3,304) (759) (873)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Noncontrolling Interest      
Net unrealized gains/losses on investment securities, Before Tax      
Net unrealized losses on investment securities arising during the period (204,250) (41,237) 15,939
Less: Reclassification adjustment for gains realized in net income   (150) 201
Less: Amortization of unrealized losses on investment securities transferred to HTM 6,218    
Net change in fair value of investment securities (198,032) (41,387) 16,140
Net unrealized gains/losses on investment securities, Tax Effect      
Net unrealized losses on investment securities arising during the period (54,109) (11,030) 4,260
Less: Reclassification adjustment for gains realized in net income   (40) 54
Less: Amortization of unrealized losses on investment securities transferred to HTM 1,520    
Net change in fair value of investment securities (52,589) (11,070) 4,314
Net unrealized gains/losses on investment securities, Net of Tax      
Net unrealized gains/losses arising during the period (150,141) (30,207) 11,679
Less: Reclassification adjustment for losses realized in net income   110 (147)
Net of tax (4,698)    
Net unrealized gains (losses) on investment securities (145,443) $ (30,317) $ 11,826
Gain (Loss) On Unrealized Losses On Derivative Instruments      
Net unrealized gains/losses on investment securities, Before Tax      
Net unrealized gains arising during the period 6,326    
Other Comprehensive Income (Loss), before Tax 6,326    
Net unrealized gains/losses on investment securities, Tax Effect      
Net unrealized gains arising during the period 1,681    
Other Comprehensive Income (Loss), Tax 1,681    
Net unrealized gains/losses on investment securities, Net of Tax      
Other comprehensive (loss) income before reclassifications 4,645    
Total other comprehensive (loss) income, net of tax $ 4,645