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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net income $ 35,926 $ 38,802 $ 36,340
Other comprehensive income, before tax      
Change in net unrealized gains (losses) on securities without other-than-temporary impairment 689 1,414 (2,213)
Reclassification adjustment for net (gain) loss recognized in net income (385) 43 618
Net unrealized gains (losses) on available-for-sale debt securities 304 1,457 (1,595)
Employee benefit plans:      
Net actuarial (loss) gain (1,217) (1,570) 565
Plan change 0 (262) 0
Reclassification adjustment for amortization of prior service cost and net actuarial loss recognized in net income 386 278 285
Net unrealized (losses) gains on employee benefit plans (831) (1,554) 850
Other comprehensive (loss) income, before tax (527) (97) (745)
Income tax expense (110) (20) (156)
Other comprehensive (loss) income, net (417) (77) (589)
Total comprehensive income $ 35,509 $ 38,725 $ 35,751