Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income	$ 98,827	$ 81,574	$ 60,016
Unrealized gain from securities:
Net unrealized holding gain (loss) from available for sale securities arising during the period, net of tax of $3,455, ($10,200) and $17,498	(6,069)	17,922	(30,727)
Reclassification adjustment of net gain from sale of available for sale securities included in income, net of tax of $574, $200 and $163	(1,007)	(352)	(299)
Net unrealized gain (loss) from securities, net of reclassification adjustment	(7,076)	17,570	(31,026)
Pension plan liability adjustment:
Unrecognized net actuarial loss and plan amendments during the period, net of tax of $2,878, $0 and $780	(5,054)	0	(1,432)
Less: amortization of unrecognized net actuarial losses included in net periodic pension cost, net of tax of ($122), ($54) and ($135)	214	95	265
Pension plan liability adjustment, net	(4,840)	95	(1,167)
Other comprehensive income (loss)	(11,916)	17,665	(32,193)
Comprehensive income	$ 86,911	$ 99,239	$ 27,823