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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Unrealized losses on available for sale securities
Balance at the beginning of the period			$ (11,337)
Current Period Change	$ (3,063)	$ 152	(6,535)	$ 2,695
Balance at the end of the period	(17,872)		(17,872)
Unrealized (losses) gain on pension benefits
Balance at the beginning of the period			(5,533)
Current Period Change	67	67	202	230
Balance at the end of the period	(5,331)		(5,331)
Unrealized gains on cash flow hedges
Balance at the beginning of the period			1,931
Current Period Change	149	303	2,679	(70)
Balance at the end of the period	4,610		4,610
Accumulated other comprehensive loss, net of income taxes
Balance at the beginning of the period			(14,939)
Current Period Change	(2,847)	$ 522	(3,654)	$ 2,855
Balance at the end of the period	$ (18,593)		$ (18,593)