COMPREHENSIVE INCOME - Components of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (AOCI)
Beginning balance	$ 176,773	$ 150,192	$ 145,625
Other comprehensive income (loss) before reclassification	5,133	(3,058)
Amounts reclassified from AOCI	352	(16)
Total other comprehensive income (loss)	5,485	(3,074)	1,289
Stranded AOCI		0
Mark to Market on equity positions held at December 31, 2017			0
Ending balance	211,936	176,773	150,192
Unrealized gains (losses) on available for-sale securities
Accumulated Other Comprehensive Income (AOCI)
Beginning balance	(3,384)	(5)
Other comprehensive income (loss) before reclassification	6,204	(3,042)
Amounts reclassified from AOCI	122	(239)
Total other comprehensive income (loss)	6,326	(3,281)
Stranded AOCI		0
Mark to Market on equity positions held at December 31, 2017			(98)
Ending balance	2,942	(3,384)	(5)
Defined benefit pension plan items
Accumulated Other Comprehensive Income (AOCI)
Beginning balance	(3,422)	(2,983)
Other comprehensive income (loss) before reclassification	(1,071)	(16)
Amounts reclassified from AOCI	198	223
Total other comprehensive income (loss)	(873)	207
Stranded AOCI		(646)
Mark to Market on equity positions held at December 31, 2017			0
Ending balance	(4,295)	(3,422)	(2,983)
Investment hedge
Accumulated Other Comprehensive Income (AOCI)
Beginning balance	0	0
Other comprehensive income (loss) before reclassification	0	0
Amounts reclassified from AOCI	32	0
Total other comprehensive income (loss)	32	0
Stranded AOCI		0
Mark to Market on equity positions held at December 31, 2017			0
Ending balance	32	0	0
AOCI attributable to parent
Accumulated Other Comprehensive Income (AOCI)
Beginning balance	(6,806)	(2,988)	(4,277)
Total other comprehensive income (loss)	5,485	(3,074)	1,289
Stranded AOCI		(646)
Mark to Market on equity positions held at December 31, 2017			(98)
Ending balance	$ (1,321)	$ (6,806)	$ (2,988)