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COMPREHENSIVE INCOME - Changes of AOCI (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Balance $ 301,405 $ 299,756
Other comprehensive (loss) income (25,204) (4,836)
Balance 276,208 300,056
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent    
Balance 4,809 11,676
Other comprehensive (loss) income (25,301) (4,829)
Balance (20,492) 6,847
Accumulated Defined Benefit Plans Adjustment Attributable to Parent    
Balance 217 119
Other comprehensive (loss) income 97 (7)
Balance 314 112
Accumulated Other Comprehensive Income    
Balance 5,026 11,795
Other comprehensive (loss) income (25,204) (4,836)
Balance $ (20,178) $ 6,959