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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net income $ 6,795 $ 5,827 $ 13,325 $ 8,318
Other comprehensive income (loss):        
Net unrealized gains (losses) 5,265 2,965 (8,367) 10,611
Tax effect 1,372 756 (2,107) 2,706
Net of tax amount 3,893 2,209 (6,260) 7,905
Change in funded status of defined benefit pension plan and other benefit plans:        
Reclassification adjustment for amortization of prior service costs (55) (55) (110) (110)
Reclassification adjustment for amortization of net actuarial loss 57 77 112 154
Total before tax effect 2 22 2 44
Tax effect 1 7 1 8
Net of tax amount 1 15 1 36
Total other comprehensive income (loss) 3,894 2,224 (6,259) 7,941
Comprehensive income $ 10,689 $ 8,051 $ 7,066 $ 16,259