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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net income $ 21,485 $ 25,126 $ 24,540
Other comprehensive income, before tax      
Change in net unrealized gains on securities without other-than-temporary impairment 1,445 1,035 755
Reclassification adjustment for net loss (gain) recognized in net income 661 (335) (144)
Reclassification adjustment for other-than-temporary impairment losses recognized in net income 4,646
Net unrealized gains on available-for-sale securities 2,106 5,346 611
Net actuarial loss 48 (367) (363)
Plan change (258) (69)
Reclassification adjustment for amortization of prior service cost and net actuarial loss recognized in net income 259 273 326
Net unrealized gains (losses) on employee benefit plans 49 (163) (37)
Other comprehensive income, before tax 2,155 5,183 574
Income tax expense (740) (1,947) (216)
Other comprehensive income (loss), net 1,415 3,236 358
Total comprehensive income $ 22,900 $ 28,362 $ 24,898