ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Summary of the Accumulated Other Comprehensive Loss Balances, Net of Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Unrealized (losses) gains on available for sale securities
Balance at the beginning of the period	$ 829
Current Period Change	4,124	$ 3,918
Balance at the end of the period	(3,295)
Unrealized (losses) gains on pension benefits
Balance at the beginning of the period	(6,775)
Current Period Change	98	90
Balance at the end of the period	(6,677)
Unrealized losses on cash flow hedges
Balance at the beginning of the period	(737)
Current Period Change	(6,807)	(1,525)
Balance at the end of the period	(7,544)
Accumulated other comprehensive loss, net of income taxes
Balance at the beginning of the period	(8,341)
Current Period Change	(2,585)	$ 2,483
Balance at the end of the period	$ (10,926)