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COMPREHENSIVE INCOME - Changes of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Balance, beginning of period $ 262,381 $ 249,325
Other comprehensive income (loss) (2,269) 7,081
Balance, end of period 261,656 255,568
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent    
Balance, beginning of period (38,878) (50,370)
Other comprehensive income (loss) (2,193) 7,099
Balance, end of period (41,071) (43,271)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent    
Balance, beginning of period 441 492
Other comprehensive income (loss) (76) (18)
Balance, end of period 365 474
Accumulated Other Comprehensive (Loss) Income    
Balance, beginning of period (38,437) (49,878)
Other comprehensive income (loss) (2,269) 7,081
Balance, end of period $ (40,706) $ (42,797)