Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income	$ 172,882	$ 112,828	$ 104,866
Unrealized loss from securities:
Net unrealized holding loss from available for sale securities arising during the period, net of tax of $4,067, $1,932 and $7,025	(13,425)	(3,391)	(12,338)
Reclassification adjustment of net gain (loss) from sale of available for sale securities included in income, net of tax of $25, ($4) and $429	(81)	7	(752)
Net unrealized loss from securities, net of reclassification adjustment	(13,506)	(3,384)	(13,090)
Pension plan liability adjustment:
Unrecognized net actuarial gain (loss) and plan amendments during the period, net of tax of ($7), ($2,287) and $22	24	4,017	(39)
Less: amortization of unrecognized net actuarial losses included in net periodic pension cost, net of tax of ($74), ($127) and ($243)	(245)	(223)	(425)
Pension plan liability adjustment, net	(269)	(4,240)	(386)
Other comprehensive income (loss)	(13,237)	856	(12,704)
Comprehensive income	$ 159,645	$ 113,684	$ 92,162