Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Consolidated Statements of Comprehensive Income
Net income	$ 69,924	$ 67,958
Other comprehensive income (loss), net of tax:
Net change in investment securities	53,441	(48,777)
Net change in cash flow derivative hedges		544
Other comprehensive income (loss)	53,441	(48,233)
Total comprehensive income	$ 123,365	$ 19,725