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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net income $ 38,802 $ 36,340 $ 21,485
Other comprehensive income, before tax      
Change in net unrealized gains (losses) on securities without other-than-temporary impairment 1,414 (2,213) 1,445
Reclassification adjustment for net loss (gain) recognized in net income 43 618 661
Net unrealized gains (losses) on available-for-sale debt securities 1,457 (1,595) 2,106
Employee benefit plans:      
Net actuarial (loss) gain (1,570) 565 48
Plan change (262) (258)
Reclassification adjustment for amortization of prior service cost and net actuarial loss recognized in net income 278 285 259
Net unrealized (losses) gains on employee benefit plans (1,554) 850 49
Other comprehensive (loss) income, before tax (97) (745) 2,155
Income tax expense (benefit) (20) (156) 740
Other comprehensive income (loss), net (77) (589) 1,415
Total comprehensive income $ 38,725 $ 35,751 $ 22,900