ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Summary of the Accumulated Other Comprehensive Loss Balances, Net of Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Unrealized (losses) gains on available for sale securities
Balance at the beginning of the period			$ 11,685
Current Period Change	$ 5,871	$ 2,616	9,789	$ (3,472)
Balance at the end of the period	1,896		1,896
Unrealized (losses) gains on pension benefits
Balance at the beginning of the period			(6,365)
Current Period Change	91	68	181	135
Balance at the end of the period	(6,184)		(6,184)
Unrealized gains (losses) on cash flow hedges
Balance at the beginning of the period			2,938
Current Period Change	(2,530)	479	(4,055)	2,530
Balance at the end of the period	(1,117)		(1,117)
Accumulated other comprehensive (loss) gain, net of income taxes
Balance at the beginning of the period			(15,112)
Current Period Change	3,432	$ 3,163	5,915	$ (807)
Balance at the end of the period	$ (9,197)		$ (9,197)