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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Before Tax    
Other comprehensive income (loss), before tax $ (23,368) $ 14,562
Tax Effect    
Other comprehensive income, tax (6,251) 3,899
Net of Tax    
Total other comprehensive (loss) income, net of tax (17,117) 10,663
Net unrealized gains on investment securities    
Before Tax    
Other comprehensive income (loss) before reclassification, before tax (23,619) 13,858
Reclassification from AOCI, before tax 0 0
Other comprehensive income (loss), before tax (23,619) 13,858
Tax Effect    
Other comprehensive income (loss) before reclassifications, tax (6,318) 3,711
Reclassification from AOCI, tax 0 0
Other comprehensive income, tax (6,318) 3,711
Net of Tax    
Other comprehensive income (loss), before reclassifications, net of tax (17,301) 10,147
Reclassification from AOCI, net of tax 0 0
Total other comprehensive (loss) income, net of tax (17,301) 10,147
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 246 268
Tax Effect    
Reclassification from AOCI, tax 66 72
Net of Tax    
Reclassification from AOCI, net of tax 180 196
Amortization of net transition obligation    
Before Tax    
Reclassification from AOCI, before tax 5 5
Tax Effect    
Reclassification from AOCI, tax 1 1
Net of Tax    
Reclassification from AOCI, net of tax 4 4
Amortization of prior service cost    
Before Tax    
Reclassification from AOCI, before tax   4
Tax Effect    
Reclassification from AOCI, tax   1
Net of Tax    
Reclassification from AOCI, net of tax   3
Defined benefit plans, net    
Before Tax    
Other comprehensive income (loss), before tax (251) (704)
Tax Effect    
Other comprehensive income, tax (67) (188)
Net of Tax    
Other comprehensive income (loss), before reclassifications, net of tax 0 313
Reclassification from AOCI, net of tax 184 203
Total other comprehensive (loss) income, net of tax $ 184 $ 516