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EMPLOYEE BENEFIT PLANS - Information about the plan (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Pension Plans    
Change in projected benefit obligation:    
Projected benefit obligation at beginning of year $ 8,926 $ 8,009
Interest cost 282 331
Actuarial loss 913 1,068
Benefits paid (319) (300)
Settlements (152) (182)
Projected benefit obligation at end of year 9,650 8,926
Change in fair value of plan assets:    
Fair value of plan assets at beginning of year 11,078 9,990
Expected return on plan assets 1,433 1,570
Benefits paid (319) (300)
Settlements (152) (182)
Fair value of plan assets at end of year 12,040 11,078
Under/(over) funded status (2,390) (2,152)
Amounts recognized in consolidated balance sheet assets (liabilities) 2,390 2,152
Non-qualified Supplemental Executive Retirement Plan    
Change in projected benefit obligation:    
Projected benefit obligation at beginning of year 2,979 3,033
Interest cost 81 103
Actuarial loss 202 221
Benefits paid (293) (378)
Projected benefit obligation at end of year 2,969 2,979
Change in fair value of plan assets:    
Contributions by employer 293 378
Benefits paid (293) (378)
Under/(over) funded status 2,969 2,979
Amounts recognized in consolidated balance sheet assets (liabilities) $ 2,969 $ 2,979