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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net income $ 25,126 $ 24,540 $ 25,490
Other comprehensive income, before tax Available-for-sale securities:      
Change in net unrealized losses on securities with other-than-temporary impairment     (1)
Change in net unrealized gains on securities without other-than-temporary impairment 1,035 755 12,914
Reclassification adjustment for net (gains) losses recognized in net income (335) (144) 1,385
Reclassification adjustment for other-than-temporary impairment losses recognized in net income 4,646   737
Net unrealized gains on available-for-sale securities 5,346 611 15,035
Employee benefit plans      
Net actuarial loss (367) (363) (642)
Plan change (69)    
Reclassification adjustment for amortization of prior service cost and net actuarial loss recognized in net income 273 326 260
Net unrealized losses on employee benefit plans (163) (37) (382)
Other comprehensive income, before tax 5,183 574 14,653
Income tax expense (1,947) (216) (5,518)
Other comprehensive income (loss), net 3,236 358 9,135
Total comprehensive income $ 28,362 $ 24,898 $ 34,625