Investment Securities (Schedule Of Realized Gross Gains And Losses On Sale From Available For Sale Portfolio) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016	Dec. 31, 2016	[2]
Schedule of Investments [Line Items]
Gross gains on sales of securities	$ 44		$ 3,837
Gross (losses) on sales of securities	0		(2,263)
Net gain/(loss) on sales of securities	44		$ 1,574
Available For Sale Securities	$ 3,939,278	[1]		$ 3,943,499

[1] Includes $ 3 . 5 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.

[2] Includes $ 3.3 billion of securities pledged to secure public deposits, securities sold under agreements to repu rchase, and for other purposes .