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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Before Tax    
Other comprehensive income (loss), before tax $ 14,562 $ 15,297
Tax Effect    
Other comprehensive income, tax 3,899 4,059
Net of Tax    
Total other comprehensive income, net of tax 10,663 11,238
Net unrealized gains on investment securities    
Before Tax    
Other comprehensive income (loss) before reclassification, before tax 13,858 15,024
Reclassification from AOCI, before tax 0 0
Other comprehensive income (loss), before tax 13,858 15,024
Tax Effect    
Other comprehensive income (loss) before reclassifications, tax 3,711 4,028
Reclassification from AOCI, tax 0 0
Other comprehensive income, tax 3,711 4,028
Net of Tax    
Other comprehensive income (loss), before reclassifications, net of tax 10,147 10,996
Reclassification from AOCI, net of tax 0 0
Total other comprehensive income, net of tax 10,147 10,996
Net actuarial gains 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 268 263
Tax Effect    
Reclassification from AOCI, tax 72 29
Net of Tax    
Reclassification from AOCI, net of tax 196 234
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 5
Tax Effect    
Reclassification from AOCI, tax 1 1
Net of Tax    
Reclassification from AOCI, net of tax 3 4
Defined benefit plans, net    
Before Tax    
Other comprehensive income (loss), before tax (704) (273)
Tax Effect    
Other comprehensive income, tax (188) (31)
Net of Tax    
Other comprehensive income (loss), before reclassifications, net of tax 313 0
Reclassification from AOCI, net of tax 203 242
Total other comprehensive income, net of tax $ 516 $ 242