Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income	$ 104,866	$ 98,827	$ 81,574
Unrealized gain (loss) from securities:
Net unrealized holding gain (loss) from available for sale securities arising during the period, net of tax of $7,025, $3,455 and ($10,200)	(12,338)	(6,069)	17,922
Reclassification adjustment of net gain from sale of available for sale securities included in income, net of tax of $429, $574 and $200	(752)	(1,007)	(352)
Net unrealized gain (loss) from securities, net of reclassification adjustment	(13,090)	(7,076)	17,570
Pension plan liability adjustment:
Unrecognized net actuarial loss and plan amendments during the period, net of tax of $22, $2,878 and $0	(39)	(5,054)	0
Less: amortization of unrecognized net actuarial losses included in net periodic pension cost, net of tax of ($243), ($122) and ($54)	425	214	95
Pension plan liability adjustment, net	386	(4,840)	95
Other comprehensive income (loss)	(12,704)	(11,916)	17,665
Comprehensive income	$ 92,162	$ 86,911	$ 99,239