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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (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
Before Tax                
Other comprehensive income (loss), before tax $ (9,090)     $ (2,744)     $ (29,825) $ 20,664
Tax Effect                
Other comprehensive income, tax (2,431)     (734)     (7,964) 5,532
Net of Tax                
Total other comprehensive (loss) income, net of tax (6,659) $ 1,915 $ (17,117) (2,010) $ 6,479 $ 10,663 (21,861) 15,132
Net unrealized gains on investment securities                
Before Tax                
Other comprehensive income (loss) before reclassification, before tax (9,254)     (3,434)     (30,466) 18,994
Reclassification from AOCI, before tax (100)     352     (150) 352
Other comprehensive income (loss), before tax (9,354)     (3,082)     (30,616) 19,346
Tax Effect                
Other comprehensive income (loss) before reclassifications, tax (2,475)     (919)     (8,150) 5,087
Reclassification from AOCI, tax (27)     94     (40) 94
Other comprehensive income, tax (2,502)     (825)     (8,190) 5,181
Net of Tax                
Other comprehensive income (loss), before reclassifications, net of tax (6,779)     (2,515)     (22,316) 13,907
Reclassification from AOCI, net of tax (73)     258     (110) 258
Total other comprehensive (loss) income, net of tax (6,852)     (2,257)     (22,426) 14,165
Net actuarial losses arising during the period                
Before Tax                
Reclassification from AOCI, before tax               (427)
Tax Effect                
Reclassification from AOCI, tax               (114)
Net of Tax                
Reclassification from AOCI, net of tax               (313)
Amortization of net actuarial loss                
Before Tax                
Reclassification from AOCI, before tax 259     330     777 867
Tax Effect                
Reclassification from AOCI, tax 70     89     222 230
Net of Tax                
Reclassification from AOCI, net of tax 189     241     555 637
Amortization of net transition obligation                
Before Tax                
Reclassification from AOCI, before tax 5     5     14 14
Tax Effect                
Reclassification from AOCI, tax 1     1     4 4
Net of Tax                
Reclassification from AOCI, net of tax 4     4     10 10
Amortization of prior service cost                
Before Tax                
Reclassification from AOCI, before tax       3       10
Tax Effect                
Reclassification from AOCI, tax       1       3
Net of Tax                
Reclassification from AOCI, net of tax       2       7
Defined benefit plans, net                
Before Tax                
Other comprehensive income (loss), before tax (264)     (338)     (791) (1,318)
Tax Effect                
Other comprehensive income, tax (71)     (91)     (226) (351)
Net of Tax                
Other comprehensive income (loss), before reclassifications, net of tax 0     0     0 313
Reclassification from AOCI, net of tax 193     247     565 654
Total other comprehensive (loss) income, net of tax $ 193     $ 247     $ 565 $ 967