Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net Income	$ 10,179	$ 10,634	$ 35,164	$ 50,630
Other comprehensive income (loss), net of tax:
Amortization of actuarial losses, net of taxes of ($64) and ($82) for the three months ended September 30, 2017 and 2016, respectively and of ($192) and ($247) for the nine months ended September 30, 2017 and 2016, respectively.	88	110	262	329
Amortization of prior service credits, net of taxes of $5 and $4 for the three months ended September 30, 2017 and 2016, respectively and $14 for each of the nine months ended September 30, 2017 and 2016.	(7)	(7)	(20)	(20)
Reclassification adjustment for net gains included in income, net of taxes of ($78) for the three and nine months ended September 30, 2017 and $1,013 for the nine months ended September 30, 2016.	108		108	(1,350)
Net unrealized (losses) gains on securities, net of taxes of $241 and $2,177 for the three months ended September 30, 2017 and 2016, respectively and of ($1,006) and ($5,103) for the nine months ended September 30, 2017 and 2016, respectively.	(333)	(2,942)	1,416	6,852
Net unrealized gain (loss) on cash flow hedges, net of taxes of ($41) and $49 for the three and nine months ended September 30, 2017, respectively.	56		(68)
Net current period other comprehensive income, net of tax	(88)	(2,839)	1,698	5,811
Comprehensive income	$ 10,091	$ 7,795	$ 36,862	$ 56,441