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COMPREHENSIVE INCOME - Changes of AOCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Balance	$ 244,452	$ 197,368
Other comprehensive income (loss) during year	8,104	7,861
Balance	299,756	244,452
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent
Balance	3,511	(4,307)
Other comprehensive income (loss) during year	8,165	7,818
Balance	11,676	3,511
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Balance	180	137
Other comprehensive income (loss) during year	(61)	43
Balance	119	180
Accumulated Other Comprehensive (Loss) Income
Balance	3,691	(4,170)
Other comprehensive income (loss) during year	8,104	7,861
Balance	$ 11,795	$ 3,691

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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