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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net income $ 51,168 $ 35,926 $ 38,802
Other comprehensive income, before tax      
Change in net unrealized (losses) gains on securities without other-than-temporary impairment (1,381) 689 1,414
Reclassification adjustment for net (gain) loss recognized in net income 0 (385) 43
Net unrealized (losses) gains on available-for-sale debt securities (1,381) 304 1,457
Employee benefit plans:      
Net actuarial gain (loss) 1,472 (1,217) (1,570)
Plan change 0 0 (262)
Reclassification adjustment for amortization of prior service cost and net actuarial loss recognized in net income 386 386 278
Net unrealized gains (losses) on employee benefit plans 1,858 (831) (1,554)
Other comprehensive income (loss), before tax 477 (527) (97)
Income tax (expense) benefit (100) 110 20
Other comprehensive (loss) income, net 377 (417) (77)
Total comprehensive income $ 51,545 $ 35,509 $ 38,725