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COMPREHENSIVE INCOME - Changes of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Balance	$ 300,056	$ 251,228	$ 299,756	$ 244,452
Other comprehensive income (loss) during year	2,317	2,237	(2,519)	8,020
Balance	304,133	255,791	304,133	255,791
Unrealized Gains (Losses) on Securities
Balance	6,847	9,230	11,676	3,511
Other comprehensive income (loss) during year	2,320	2,242	(2,509)	7,961
Balance	9,167	11,472	9,167	11,472
Unfunded Retirement Obligations
Balance	112	244	119	180
Other comprehensive income (loss) during year	(3)	(5)	(10)	59
Balance	109	239	109	239
Accumulated Other Comprehensive Income (Loss)
Balance	6,959	9,474	11,795	3,691
Other comprehensive income (loss) during year	2,317	2,237	(2,519)	8,020
Balance	$ 9,276	$ 11,711	$ 9,276	$ 11,711

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