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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, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Amounts reclassified out of each component of accumulated other comprehensive income                
Investment securities gains (losses) $ (352)     $ 36     $ (352) $ 36
Income tax benefit (expense) (2,200)     (4,895)     (7,988) (14,440)
Net income 6,859 $ 9,917 $ 8,326 14,554 $ 13,534 $ 16,037 25,102 44,125
Amount Reclassified from AOCI                
Amounts reclassified out of each component of accumulated other comprehensive income                
Net income (505)     (257)     (912) (747)
Investment Securities                
Amounts reclassified out of each component of accumulated other comprehensive income                
Reclassification from AOCI, net of tax (258)     26     (258) 26
Investment Securities | Amount Reclassified from AOCI                
Amounts reclassified out of each component of accumulated other comprehensive income                
Investment securities gains (losses) (352)     36     (352) 36
Income tax benefit (expense) 94     (10)     94 (10)
Net income (258)     26     (258) 26
Defined Benefit Plans                
Amounts reclassified out of each component of accumulated other comprehensive income                
Reclassification from AOCI, net of tax (247)     (283)     (654) (773)
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 (338)     (319)     (891) (864)
Amortization of defined benefit plan items, tax 91     36     237 91
Reclassification from AOCI, net of tax (247)     (283)     (654) (773)
Amortization of net actuarial loss                
Amounts reclassified out of each component of accumulated other comprehensive income                
Amortization of defined benefit plan items, before tax (330)     (310)     (867) (837)
Amortization of defined benefit plan items, tax 89     31     230 84
Reclassification from AOCI, net of tax (241)     (279)     (637) (753)
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 (330)     (310)     (867) (837)
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     3     4 4
Reclassification from AOCI, net of tax (4)     (2)     (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)     (4)     (10) (13)
Amortization of defined benefit plan items, tax 1     2     3 3
Reclassification from AOCI, net of tax (2)     (2)     (7) (10)
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 $ (3)     $ (4)     $ (10) $ (13)