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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
AOCI Roll Forward                
Balance $ (2,748) $ (2,175)            
Change during the period ended                
Adoption of accounting standard (Note 2) (80,475) (82,137) $ (76,568) $ (76,986) $ (77,212) $ (79,076) $ (74,230) $ (75,212)
Before-tax amount 128 13            
Tax provision (28) (3)            
Reclassification adjustment, net of taxes                
Amortization of net loss 57 50            
Net realized gain   (3)            
Total activity for the period 157 47            
Balance (2,591) (2,532)            
Cumulative Effect, Period of Adoption, Adjustment                
Change during the period ended                
Adoption of accounting standard (Note 2)   (414)            
Pension adjustment                
AOCI Roll Forward                
Balance (2,748) (2,178)            
Change during the period ended                
Before-tax amount 128              
Tax provision (28)              
Reclassification adjustment, net of taxes                
Amortization of net loss 57 50            
Total activity for the period 157 50            
Balance $ (2,591) (2,532)            
Pension adjustment | Cumulative Effect, Period of Adoption, Adjustment                
Change during the period ended                
Adoption of accounting standard (Note 2)   (404)            
Unrealized Gain (Loss) on Securities                
AOCI Roll Forward                
Balance   3            
Change during the period ended                
Before-tax amount   13            
Tax provision   (3)            
Reclassification adjustment, net of taxes                
Net realized gain   (3)            
Total activity for the period   (3)            
Unrealized Gain (Loss) on Securities | Cumulative Effect, Period of Adoption, Adjustment                
Change during the period ended                
Adoption of accounting standard (Note 2)   $ (10)