Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 72,475	$ 49,014
Other comprehensive income before income taxes:
Net change in unrealized gain/loss on available for sale securities and hedges	(62,244)	1,184
Reclassification of net losses realized and included in earnings	1,796	1,387
Amortization of unrealized net loss on securities transferred to held to maturity	755	650
Other comprehensive income/loss before income taxes	(59,693)	3,221
Income tax expense (benefit)	(13,546)	1,201
Other comprehensive income/loss net of income taxes	(46,147)	2,020
Comprehensive income	$ 26,328	$ 51,034