Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 49,014	$ 3,839
Other comprehensive income:
Net change in unrealized gain on securities available for sale and hedges	1,184	28,972
Reclassification of net losses realized and included in earnings	1,387	1,091
Amortization of unrealized net gain on securities transferred to held to maturity	650	798
Other comprehensive income before income taxes	3,221	30,861
Income tax expense	1,201	11,332
Other comprehensive income net of income taxes	2,020	19,529
Comprehensive income	$ 51,034	$ 23,368