Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net income		$ 25,405	$ 21,946	$ 46,664	$ 46,307
Unrealized gain from securities:
Net unrealized holding loss from available for sale securities arising during the period		8,508	(11,341)	27,278	(1,965)
Reclassification adjustment of net gain from sale of available for sale securities included in income		(146)	(219)	(384)	(678)
Net unrealized gain from securities, net of reclassification adjustment		8,362	(11,560)	26,894	(2,643)
Pension plan liability adjustment:
Unrecognized net actuarial gain (loss) during the period				0	(280)
Less: amortization of unrecognized net actuarial loss included in net periodic pension cost		106	63	212	91
Pension plan liability adjustment, net		106	63	212	(189)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	[1]	8,468	(11,497)	27,106	(2,832)
Total comprehensive income		$ 33,873	$ 10,449	$ 73,770	$ 43,475

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