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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Unrealized (losses) gains on available for sale securities
Balance at the beginning of the period			$ 11,685
Current Period Change	$ 1,578	$ (3,063)	11,367	$ (6,535)
Balance at the end of the period	318		318
Unrealized (losses) gains on pension benefits
Balance at the beginning of the period			(6,365)
Current Period Change	91	67	272	202
Balance at the end of the period	(6,093)		(6,093)
Unrealized gains (losses) on cash flow hedges
Balance at the beginning of the period			2,938
Current Period Change	(700)	149	(4,755)	2,679
Balance at the end of the period	(1,817)		(1,817)
Accumulated other comprehensive (loss) gain, net of income taxes
Balance at the beginning of the period			(15,112)
Current Period Change	969	$ (2,847)	6,884	$ (3,654)
Balance at the end of the period	$ (8,228)		$ (8,228)