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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Amounts reclassified out of each component of accumulated other comprehensive income    
Net income $ 18,038 $ 8,326
Amount Reclassified from AOCI    
Amounts reclassified out of each component of accumulated other comprehensive income    
Net income (184) (203)
Investment Securities    
Amounts reclassified out of each component of accumulated other comprehensive income    
Reclassification from AOCI, net of tax 0 0
Defined Benefit Plans    
Amounts reclassified out of each component of accumulated other comprehensive income    
Reclassification from AOCI, net of tax (184) (203)
Defined Benefit Plans | Amount Reclassified from AOCI    
Amounts reclassified out of each component of accumulated other comprehensive income    
Amortization of defined benefit plan items, before tax (251) (277)
Amortization of defined benefit plan items, tax 67 74
Reclassification from AOCI, net of tax (184) (203)
Amortization of net actuarial loss    
Amounts reclassified out of each component of accumulated other comprehensive income    
Amortization of defined benefit plan items, before tax (246) (268)
Amortization of defined benefit plan items, tax 66 72
Reclassification from AOCI, net of tax (180) (196)
Amortization of net actuarial loss | Amount Reclassified from AOCI    
Amounts reclassified out of each component of accumulated other comprehensive income    
Amortization of defined benefit plan items, before tax (246) (268)
Amortization of net transition obligation    
Amounts reclassified out of each component of accumulated other comprehensive income    
Amortization of defined benefit plan items, before tax (5) (5)
Amortization of defined benefit plan items, tax 1 1
Reclassification from AOCI, net of tax (4) (4)
Amortization of net transition obligation | Amount Reclassified from AOCI    
Amounts reclassified out of each component of accumulated other comprehensive income    
Amortization of defined benefit plan items, before tax (5) (5)
Amortization of prior service cost    
Amounts reclassified out of each component of accumulated other comprehensive income    
Amortization of defined benefit plan items, before tax   (4)
Amortization of defined benefit plan items, tax   1
Reclassification from AOCI, net of tax   (3)
Amortization of prior service cost | Amount Reclassified from AOCI    
Amounts reclassified out of each component of accumulated other comprehensive income    
Amortization of defined benefit plan items, before tax $ 0 $ (4)