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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Before Tax            
Other comprehensive income (loss), before tax $ 8,846   $ 16,892   $ 23,408 $ 32,189
Tax Effect            
Other comprehensive income, tax 2,367   4,479   6,266 8,538
Net of Tax            
Total other comprehensive income, net of tax 6,479 $ 10,663 12,413 $ 11,238 17,142 23,651
Net unrealized gains on investment securities            
Before Tax            
Other comprehensive income (loss) before reclassification, before tax 8,570   16,620   22,428 31,644
Reclassification from AOCI, before tax 0   0   0 0
Other comprehensive income (loss), before tax 8,570   16,620   22,428 31,644
Tax Effect            
Other comprehensive income (loss) before reclassifications, tax 2,295   4,455   6,006 8,483
Reclassification from AOCI, tax 0   0   0 0
Other comprehensive income, tax 2,295   4,455   6,006 8,483
Net of Tax            
Other comprehensive income (loss), before reclassifications, net of tax 6,275   12,165   16,422 23,161
Reclassification from AOCI, net of tax 0   0   0 0
Total other comprehensive income, net of tax 6,275   12,165   16,422 23,161
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 269   264   537 527
Tax Effect            
Reclassification from AOCI, tax 70   22   142 51
Net of Tax            
Reclassification from AOCI, net of tax 199   242   395 476
Amortization of net transition obligation            
Before Tax            
Reclassification from AOCI, before tax 4   4   9 9
Tax Effect            
Reclassification from AOCI, tax 1   1   2 2
Net of Tax            
Reclassification from AOCI, net of tax 3   3   7 7
Amortization of prior service cost            
Before Tax            
Reclassification from AOCI, before tax 3   4   7 9
Tax Effect            
Reclassification from AOCI, tax 1   1   2 2
Net of Tax            
Reclassification from AOCI, net of tax 2   3   5 7
Defined benefit plans, net            
Before Tax            
Other comprehensive income (loss), before tax (276)   (272)   (980) (545)
Tax Effect            
Other comprehensive income, tax (72)   (24)   (260) (55)
Net of Tax            
Other comprehensive income (loss), before reclassifications, net of tax 0   0   313 0
Reclassification from AOCI, net of tax 204   248   407 490
Total other comprehensive income, net of tax $ 204   $ 248   $ 720 $ 490