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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Net income $ 11,008 $ 11,201 $ 34,575 $ 33,182
Other comprehensive income (loss), net of tax:        
Amortization of actuarial losses 173 98 518 259
Amortization of prior service credits (6) (6) (19) (16)
Reclassificaton adjustment for net gains included in income (58) (2,978) (94) (2,978)
Net unrealized (losses) gains on securities 3,943 (2,206) 2,798 9,667
Total other comprehensive income (loss), net of tax 4,052 (5,092) 3,203 6,932
Comprehensive income $ 15,060 $ 6,109 $ 37,778 $ 40,114