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COMPREHENSIVE INCOME - Changes of AOCI (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Balance $ 299,756 $ 244,452
Other comprehensive income (loss) during year (6,769) 8,104
Balance 301,405 299,756
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent    
Balance 11,676 3,511
Other comprehensive income (loss) during year (6,867) 8,165
Balance 4,809 11,676
Accumulated Defined Benefit Plans Adjustment Attributable to Parent    
Balance 119 180
Other comprehensive income (loss) during year 98 (61)
Balance 217 119
Accumulated Other Comprehensive Income    
Balance 11,795 3,691
Other comprehensive income (loss) during year (6,769) 8,104
Balance $ 5,026 $ 11,795