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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 $ 41,121 $ 64,916 $ 46,209
Other comprehensive income (loss), net of tax:      
Amortization of prior service credits, net of taxes of $12, $18 and $20 for the years ended December 31, 2017, 2016 and 2015, respectively (33) (27) (26)
Amortization of net actuarial losses, net of taxes of ($249), ($238) and ($509) for the years ended December 31, 2017, 2016 and 2015, respectively 356 330 669
Unrecognized actuarial gains, net of taxes of ($146), ($367) and ($465) for the years ended December 31, 2017, 2016 and 2015, respectively 485 235 615
Change in net unrealized losses on securities available for sale, net of taxes of $1,783, $1,737 and $2,911 for the years ended December 31, 2017, 2016 and 2015, respectively (1,771) (2,452) (3,818)
Reclassification adjustment for net losses (gains) included in net income, net of taxes of ($78), $638 and $72 for the years ended December 31, 2017, 2016 and 2015, respectively 108 (886) (95)
Net unrealized gain on cashflow hedges, net of taxes of ($179) for the year ended December 31, 2017 231
Total other comprehensive income (loss), net of tax (624) (2,800) (2,655)
Comprehensive income $ 40,497 $ 62,116 $ 43,554