CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 41,056	$ 39,634	$ 79,873	$ 76,313
Other comprehensive income (loss), net of tax:
Unrealized holding gain (loss) on securities available for sale arising during the period, net of tax of $4,822, $683, $10,402, and $4,874	18,140	(2,570)	39,130	(20,268)
Unrealized gain (loss) on cash flow hedges arising during the period, net of tax of $148, $61, $230 and $167	(553)		(862)
Unrealized gain (loss) on cash flow hedges arising during the period, net of tax of $148, $61, $230 and $167		230		874
Reclassification adjustment for net gains included in net income, net of tax of $369, $214, $596 and $516	(1,390)	(803)	(2,244)	(1,940)
Total other comprehensive income (loss), net of tax	16,197	(3,143)	36,024	(21,334)
Comprehensive income	$ 57,253	$ 36,491	$ 115,897	$ 54,979