CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 23,193	$ 17,693
Other comprehensive income net of tax:
Unrealized holding gain on securities available for sale arising during the period, net of tax of $5,444 and $2,765	10,110	5,135
Unrealized gain (loss) on cash flow hedges arising during the period, net of tax of $11 and $684	23	(1,270)
Reclassification adjustment for net gains included in net income, net of tax of $115 and $236	(215)	(437)
Defined benefit pension plan amortization of prior service cost, net of tax of $32	(59)
Period change	9,859	3,428
Comprehensive income	$ 33,052	$ 21,121