CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 38,817	$ 36,679
Other comprehensive income (loss), net of tax:
Unrealized holding gain (loss) on securities available for sale arising during the period, net of tax of $5,580 and $4,191	20,990	(17,698)
Unrealized gain (loss) on cash flow hedges arising during the period, net of tax of $82 and $106	(309)	644
Reclassification adjustment for net gains included in net income, net of tax of $227 and $302	(854)	(1,137)
Total other comprehensive income (loss), net of tax	19,827	(18,191)
Comprehensive income	$ 58,644	$ 18,488