Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Consolidated Statements of Comprehensive Income
Net income	$ 67,388	$ 58,363	$ 204,399	$ 171,998
Other comprehensive (loss) income, net of tax:
Net unrealized (losses) gains on investment securities	(22,420)	128	(89,236)	19,970
Net unrealized gains on cash flow derivative hedges	131	409	988	927
Other comprehensive (loss) income	(22,289)	537	(88,248)	20,897
Total comprehensive income	$ 45,099	$ 58,900	$ 116,151	$ 192,895