Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Net income		$ 27,132	$ 25,405	$ 56,331	$ 46,664
Unrealized gain from securities:
Net unrealized holding loss from available for sale securities arising during the period		6,033	8,508	7,735	27,278
Reclassification adjustment of net gain from sale of available for sale securities included in income		0	(146)	0	(384)
Net unrealized gain from securities, net of reclassification adjustment		6,033	8,362	7,735	26,894
Pension plan liability adjustment:
Unrecognized net actuarial gain (loss) during the period				4,604	0
Less: amortization of unrecognized net actuarial loss included in net periodic pension cost		45	106	132	212
Pension plan liability adjustment, net		45	106	4,736	212
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	[1]	6,078	8,468	12,471	27,106
Total comprehensive income		$ 33,210	$ 33,873	$ 68,802	$ 73,770

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