ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Summary of the Accumulated Other Comprehensive Loss Balances, Net of Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Unrealized (losses) gains on available for sale securities
Balance at the beginning of the period			$ 829
Current Period Change	$ (3,166)	$ 1,578	4,006	$ 11,367
Balance at the end of the period	(3,177)		(3,177)
Unrealized (losses) gains on pension benefits
Balance at the beginning of the period			(6,775)
Current Period Change	97	91	292	272
Balance at the end of the period	(6,483)		(6,483)
Unrealized losses on cash flow hedges
Balance at the beginning of the period			(737)
Current Period Change	3,082	(700)	(4,706)	(4,755)
Balance at the end of the period	(5,443)		(5,443)
Accumulated other comprehensive loss, net of income taxes
Balance at the beginning of the period			(8,341)
Current Period Change	13	$ 969	(408)	$ 6,884
Balance at the end of the period	$ (8,749)		$ (8,749)