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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2022
Jun. 30, 2021
Amounts reclassified out of each component of accumulated other comprehensive income            
Net gain on sales of investment securities $ 8,506   $ 50   $ 8,506 $ 50
Income tax (expenses) benefit (6,184)   (5,887)   (12,222) (11,339)
Total reclassification adjustments from AOCI for the period, net of tax 17,594 $ 19,438 18,714 $ 18,038 37,032 36,752
Amortization         1,976 0
Amortization of net actuarial loss            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization of defined benefit plan items, before tax (131)   (272)   (264) (518)
Reclassification from AOCI, tax 35   87   71 153
Net of tax (96)   (185)   (193) (365)
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)   (4)   (9) (9)
Reclassification from AOCI, tax 1   1   2 2
Net of tax (4)   (3)   (7) (7)
Settlement            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization of defined benefit plan items, before tax (4,884)       (4,884)  
Reclassification from AOCI, tax 1,817       1,817  
Net of tax (3,067)       (3,067)  
Defined benefit retirement plan and SERPs            
Amounts reclassified out of each component of accumulated other comprehensive income            
Net of tax (3,167)   (188)   (3,267) (372)
Investment Securities            
Amounts reclassified out of each component of accumulated other comprehensive income            
Net of tax (1,448)   37   (1,448) 37
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 (4,615)   (151)   (4,715) (335)
Amount Reclassified from AOCI | Amortization of net actuarial loss            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization of defined benefit plan items, before tax (131)   (272)   (264) (518)
Amount Reclassified from AOCI | 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)   (4)   (9) (9)
Amount Reclassified from AOCI | Amortization of prior service cost            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization of defined benefit plan items, before tax 0   0   0 0
Amount Reclassified from AOCI | Settlement            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization of defined benefit plan items, before tax (4,884)   0   (4,884) 0
Amount Reclassified from AOCI | Defined benefit retirement plan and SERPs            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization of defined benefit plan items, before tax (5,020)   (276)   (5,157) (527)
Reclassification from AOCI, tax 1,853   88   1,890 155
Net of tax (3,167)   (188)   (3,267) (372)
Amount Reclassified from AOCI | Investment Securities            
Amounts reclassified out of each component of accumulated other comprehensive income            
Net gain on sales of investment securities         0 50
Income tax (expenses) benefit         0 (13)
Total reclassification adjustments from AOCI for the period, net of tax         0 37
Amount Reclassified from AOCI | Accumulated Net Unrealized Loss on Held To Maturity Securities            
Amounts reclassified out of each component of accumulated other comprehensive income            
Amortization (1,976)   0   (1,976) 0
Less: Amortization of unrealized losses on investment securities transferred to held-to-maturity 528   0   528 0
Net of tax $ (1,448)   $ 0   $ (1,448) $ 0