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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Amounts reclassified out of each component of accumulated other comprehensive income    
Income tax (expenses) benefit $ (6,038) $ (5,452)
Total reclassification adjustments from AOCI for the period, net of tax 19,438 18,038
Amount Reclassified from AOCI    
Amounts reclassified out of each component of accumulated other comprehensive income    
Total reclassification adjustments from AOCI for the period, net of tax (100) (184)
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 (100) (184)
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 (137) (251)
Amortization of defined benefit plan items, tax 37 67
Reclassification from AOCI, net of tax (100) (184)
Amortization of net actuarial loss    
Amounts reclassified out of each component of accumulated other comprehensive income    
Amortization of defined benefit plan items, before tax (133) (246)
Amortization of defined benefit plan items, tax 36 66
Reclassification from AOCI, net of tax (97) (180)
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 (133) (246)
Amortization of net transition obligation    
Amounts reclassified out of each component of accumulated other comprehensive income    
Amortization of defined benefit plan items, before tax (4) (5)
Amortization of defined benefit plan items, tax 1 1
Reclassification from AOCI, net of tax (3) (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 $ (4) $ (5)