ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Loss [Line Items]
Beginning balance	[1]	$ (12,950)	$ (11,577)	$ (7,555)
Reclassification of certain income tax effects from accumulated other comprehensive loss	[1]	0	(2,131)	0
Other comprehensive income (loss) before reclassifications	[1]	(2,845)	1,044	(4,425)
Amounts reclassified from accumulated other comprehensive loss	[1],[2]	1,570	(286)	403
Net current period other comprehensive loss	[1]	(1,275)	(1,373)	(4,022)
Ending balance	[1]	(14,225)	(12,950)	(11,577)
Net Unrealized Gains and (Losses) on Investment Securities AFS [Member]
Accumulated Other Comprehensive Loss [Line Items]
Beginning balance	[1]	(327)	(171)	808
Reclassification of certain income tax effects from accumulated other comprehensive loss	[1]	0	(53)	0
Other comprehensive income (loss) before reclassifications	[1]	(1,429)	(27)	(862)
Amounts reclassified from accumulated other comprehensive loss	[1]	347	(76)	(117)
Net current period other comprehensive loss	[1]	(1,082)	(156)	(979)
Ending balance	[1]	(1,409)	(327)	(171)
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Loss [Line Items]
Beginning balance	[1]	(12,623)	(11,406)	(8,363)
Reclassification of certain income tax effects from accumulated other comprehensive loss	[1]	0	(2,078)	0
Other comprehensive income (loss) before reclassifications	[1]	(1,416)	1,071	(3,563)
Amounts reclassified from accumulated other comprehensive loss	[1]	1,223	(210)	520
Net current period other comprehensive loss	[1]	(193)	(1,217)	(3,043)
Ending balance	[1]	$ (12,816)	$ (12,623)	$ (11,406)

[1] Amounts in parentheses indicate debits on the Consolidated Balance Sheets.

[2] Amounts in parentheses indicate credits.