ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of the Accumulated Other Comprehensive Loss Balances, Net of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unrealized (losses) gains on available for sale securities
Balance at the beginning of the period	$ (11,685)
Current Period Change	10,856	$ (348)	$ (505)
Balance at the end of the period	829	(11,685)
Unrealized losses on pension benefits
Balance at the beginning of the period	(6,365)
Current Period Change	(410)	(832)	193
Balance at the end of the period	(6,775)	(6,365)
Unrealized gains (losses) on cash flow hedges
Balance at the beginning of the period	2,938
Current Period Change	(3,675)	1,007	1,089
Balance at the end of the period	(737)	2,938
Accumulated other comprehensive (loss) income, net of income taxes
Balance at the beginning of the period	(15,112)
Current Period Change	6,771	(173)	$ 777
Balance at the end of the period	$ (8,341)	$ (15,112)