CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 24,136	$ 20,006	$ 47,329	$ 37,699
Other comprehensive income net of tax:
Unrealized holding gain on securities available for sale arising during the period, net of tax of $3,033, $3,096, $8,476 and $5,861	5,632	5,750	15,741	10,885
Unrealized loss on cash flow hedges arising during the period, net of tax of $142, $284, $131 and $969	(262)	(529)	(239)	(1,798)
Reclassification adjustment for net gains included in net income, net of tax of $110, $136, $226 and $371	(206)	(252)	(420)	(690)
Defined benefit pension plan amortization of prior service cost, net of tax of $31 and $63	(58)		(117)
Period change	5,106	4,969	14,965	8,397
Comprehensive income	$ 29,242	$ 24,975	$ 62,294	$ 46,096