Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income		$ 41,749	$ 27,132	$ 81,719	$ 56,331
Unrealized gain from securities:
Net unrealized holding loss from available for sale securities arising during the period		(7,845)	6,033	(33,893)	7,735
Reclassification adjustment of net gain from sale of available for sale securities included in income		(4)	0	(82)	0
Net unrealized gain from securities, net of reclassification adjustment		(7,849)	6,033	(33,975)	7,735
Pension plan liability adjustment:
Unrecognized net actuarial gain (loss) during the period				0	4,604
Less: amortization of unrecognized net actuarial loss included in net periodic pension cost		61	45	122	132
Pension plan liability adjustment, net		61	45	122	4,736
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	[1]	(7,788)	6,078	(33,853)	12,471
Total comprehensive income		$ 33,961	$ 33,210	$ 47,866	$ 68,802

[1] All amounts are net of tax. Amounts in parenthesis indicate debits.