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COMPREHENSIVE INCOME - Changes of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Balance	$ 304,133	$ 255,791	$ 299,756	$ 244,452
Other comprehensive income (loss) during year	(2,871)	(102)	(5,390)	7,918
Balance	299,402	296,316	299,402	296,316
Unrealized Gains (Losses) on Securities
Balance	9,167	11,472	11,676	3,511
Other comprehensive income (loss) during year	(2,867)	(96)	(5,376)	7,865
Balance	6,300	11,376	6,300	11,376
Unfunded Retirement Obligations
Balance	109	239	119	180
Other comprehensive income (loss) during year	(4)	(6)	(14)	53
Balance	105	233	105	233
Accumulated Other Comprehensive Income (Loss)
Balance	9,276	11,711	11,795	3,691
Other comprehensive income (loss) during year	(2,871)	(102)	(5,390)	7,918
Balance	$ 6,405	$ 11,609	$ 6,405	$ 11,609

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