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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Net income $ 9,561 $ 8,733
Other comprehensive income, net of tax:    
Amortization of actuarial losses, net of taxes of ($83) and ($133) for the three months ended March 31, 2016 and 2015, respectively 109 174
Amortization of prior service credits, net of taxes of $5 and $5 for the three months ended March 31, 2016 and 2015, respectively (6) (6)
Net unrealized gains on securities, net of taxes of ($5,028) and ($3,293) for the three months ended March 31, 2016 and 2015, respectively 6,770 4,332
Total other comprehensive income, net of tax 6,873 4,500
Comprehensive income $ 16,434 $ 13,233