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BENEFIT PLANS (Details) (Imported) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Pension Benefits [Member]    
Pension Plans [Abstract]    
Contribution made to defined benefit pension plan by employer $ 2,800  
Net periodic benefit cost [Abstract]    
Service cost 1,480 $ 1,438
Interest cost 1,259 1,356
Expected return on plan assets (4,696) (3,932)
Amortization of unrecognized net loss 900 810
Amortization of prior service cost 95 60
Net periodic benefit (962) (268)
Post-retirement Benefits [Member]    
Net periodic benefit cost [Abstract]    
Service cost 0 0
Interest cost 11 14
Expected return on plan assets 0 0
Amortization of unrecognized net loss 11 10
Amortization of prior service cost (45) (45)
Net periodic benefit (23) $ (21)
Steuben Trust Company Pension Plan    
Pension Plans [Abstract]    
Contribution made to defined benefit pension plan by employer $ 90