Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net income	$ 30,435	$ 14,834	$ 39,996	$ 23,567
Other comprehensive income, net of tax:
Amortization of actuarial losses, net of taxes of ($82) and ($135) for the three months ended June 30, 2016 and 2015, respectively and of ($165) and ($268) for the six months ended June 30, 2016 and 2015, respectively.	110	171	219	345
Amortization of prior service credits, net of taxes of $5 for each of the three months ended June 30, 2016 and 2015, respectively and of $10 for each of the six months ended June 30, 2016 and 2015, respectively.	(7)	(7)	(13)	(13)
Reclassification adjustment for net gains included in income, net of taxes of $1,013 and $28 for the three and six months ended June 30, 2016 and 2015, respectively.	(1,350)	(36)	(1,350)	(36)
Net unrealized gains on securities, net of taxes of ($2,252) and $4,126 for the three months ended June 30, 2016 and 2015, respectively and of ($7,280) and $833 for the six months ended June 30, 2016 and 2015, respectively.	3,024	(5,477)	9,794	(1,145)
Total other comprehensive income (loss), net of tax	1,777	(5,349)	8,650	(849)
Comprehensive income	$ 32,212	$ 9,485	$ 48,646	$ 22,718