ACCUMULATED OTHER COMPREHENSIVE INCOME, CHANGES IN AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	$ 218,985	$ 150,271
Before reclassifications	5,360	(1,858)
Reclassifications	32	6
Balance at end of year	228,048	218,985
Unrealized Gains and Losses on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	(4,631)	(2,698)
Before reclassifications	5,456	(1,939)
Reclassifications	32	6
Balance at end of year	857	(4,631)
Changes in Pension Plan Assets and Benefit Obligations
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	(88)	(169)
Before reclassifications	(96)	81
Reclassifications	0	0
Balance at end of year	(184)	(88)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year	(4,719)	(2,867)
Balance at end of year	673	(4,719)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year		150,271
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Unrealized Gains and Losses on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year		(2,200)
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Changes in Pension Plan Assets and Benefit Obligations
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year		(142)
Calculated under Revenue Guidance in Effect before Topic 606 [Member] | Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of year		(2,342)
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of changes in accounting principles		0
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Unrealized Gains and Losses on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of changes in accounting principles	0	(498)
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Changes in Pension Plan Assets and Benefit Obligations
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of changes in accounting principles	0	(27)
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of changes in accounting principles	$ 0	$ (525)