RETIREMENT PLANS - Amounts in Consolidated Financials (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Pension Plans
Amounts recognized on the consolidated balance sheets
Other Liabilities	$ 540	$ 744
Other Assets	1,913	1,375
Accumulated other comprehensive income, net of tax	1,484	938
Amounts recognized in accumulated other comprehensive loss
Net actuarial gain	540	30
Accumulated other comprehensive income, pre-tax	540	30
Accumulated other comprehensive income, net of tax	1,484	938
Postretirement Benefits
Amounts recognized on the consolidated balance sheets
Accrued and current liabilities	340	271
Other Liabilities	4,559	3,742
Accumulated other comprehensive income, net of tax	359	1,350
Amounts recognized in accumulated other comprehensive loss
Net actuarial gain	359	1,350
Accumulated other comprehensive income, pre-tax	359	1,350
Accumulated other comprehensive income, net of tax	$ 359	$ 1,350