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COMPREHENSIVE INCOME - Changes of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Balance	$ 299,756	$ 244,452
Other comprehensive income (loss) during year	(4,836)	5,783
Balance	300,056	251,228
Unrealized Gains (Losses) on Securities
Balance	11,676	3,511
Other comprehensive income (loss) during year	(4,829)	5,719
Balance	6,847	9,230
Unfunded Retirement Obligations
Balance	119	180
Other comprehensive income (loss) during year	(7)	64
Balance	112	244
Accumulated Other Comprehensive Income
Balance	11,795	3,691
Other comprehensive income (loss) during year	(4,836)	5,783
Balance	$ 6,959	$ 9,474

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