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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Reclassified out of AOCI) (LOSS) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Amounts reclassified out of each component of accumulated other comprehensive income                
Investment securities gains (losses) $ 100     $ (352)     $ 150 $ (352)
Income tax (expenses) benefit (6,814)     (2,200)     (18,153) (7,988)
Total reclassification adjustments from AOCI for the period, net of tax 20,815 $ 18,714 $ 18,038 6,859 $ 9,917 $ 8,326 57,567 25,102
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 (120)     (505)     (455) (912)
Investment Securities                
Amounts reclassified out of each component of accumulated other comprehensive income                
Reclassification from AOCI, net of tax 73     (258)     110 (258)
Investment Securities | Amount Reclassified from AOCI                
Amounts reclassified out of each component of accumulated other comprehensive income                
Investment securities gains (losses) 100     (352)     150 (352)
Income tax (expenses) benefit (27)     94     (40) 94
Total reclassification adjustments from AOCI for the period, net of tax 73     (258)     110 (258)
Defined Benefit Plans                
Amounts reclassified out of each component of accumulated other comprehensive income                
Reclassification from AOCI, net of tax (193)     (247)     (565) (654)
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 (264)     (338)     (791) (891)
Amortization of defined benefit plan items, tax 71     91     226 237
Reclassification from AOCI, net of tax (193)     (247)     (565) (654)
Amortization of net actuarial loss                
Amounts reclassified out of each component of accumulated other comprehensive income                
Amortization of defined benefit plan items, before tax (259)     (330)     (777) (867)
Amortization of defined benefit plan items, tax 70     89     222 230
Reclassification from AOCI, net of tax (189)     (241)     (555) (637)
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 (259)     (330)     (777) (867)
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)     (14) (14)
Amortization of defined benefit plan items, tax 1     1     4 4
Reclassification from AOCI, net of tax (4)     (4)     (10) (10)
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)     (14) (14)
Amortization of prior service cost                
Amounts reclassified out of each component of accumulated other comprehensive income                
Amortization of defined benefit plan items, before tax       (3)       (10)
Amortization of defined benefit plan items, tax       1       3
Reclassification from AOCI, net of tax       (2)       (7)
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     $ (3)     $ 0 $ (10)