CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 36,757	$ 41,113	$ 116,630	$ 117,426
Other comprehensive income (loss), net of tax:
Unrealized holding gain (loss) on securities available for sale arising during the period, net of tax of $3,034, $2,596, $13,436, and $7,470	11,415	(9,765)	50,545	(30,032)
Unrealized gain (loss) on cash flow hedges arising during the period, net of tax of $37, $44, $267 and $212	(141)	166	(1,003)	1,039
Reclassification adjustment for net gains included in net income, net of tax of $61, $250, $657 and $766	(228)	(942)	(2,472)	(2,882)
Total other comprehensive income (loss), net of tax	11,046	(10,541)	47,070	(31,875)
Comprehensive income	$ 47,803	$ 30,572	$ 163,700	$ 85,551