Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net income for the period	$ 127,263	$ 100,999	$ 331,649	$ 206,984
Other comprehensive income, net of tax:
Unrealized holding gains (losses) on investment securities	(10,711)	11,268	54,316	4,460
Reclassification of HTM securities to AFS Securities	0	0	0	10,938
Reclassification to earnings for realized net fixed income securities losses (gains)	(24)	33	(57)	85,845
Net unrealized gains (losses) on other noninterest-bearing investments	2,158	(1,881)	2,022	94
Net unrealized holding gains (losses) on derivative instruments	(3,336)	10,607	14,415	12,941
Reclassification adjustment for increase in interest income recognized in earnings on derivatives instruments	(1,738)	(1,830)	(5,418)	(3,212)
Pension and Postretirement	0	0	(665)	0
Other comprehensive income (loss)	(13,651)	18,197	64,613	111,066
Comprehensive income	$ 113,612	$ 119,196	$ 396,262	$ 318,050