Fair Value Of Assets And Liabilities (Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Trading Account Assets [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		$ 2,573	$ 4,377
Net income		17	147
Purchases, assets		0	0
Settlements, assets		(255)	(1,467)
Net transfers into/(out of) Level 3, assets		0	0
Ending Balance		2,335	3,057
Net unrealized gains/(losses) included in net income	[1]	(27)	(115)
Loans Held For Sale [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		21,924	27,418
Net income		922	342
Purchases, assets		32	148
Settlements, assets		(1,574)	(1,365)
Net transfers into/(out of) Level 3, assets	[2]	(83)	(256)
Ending Balance		21,221	26,287
Net unrealized gains/(losses) included in net income	[1]	922	342
AFS Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance			1,500
Net income			0
Purchases, assets			0
Settlements, assets			0
Net transfers into/(out of) Level 3, assets			0
Ending Balance			1,500
Net unrealized gains/(losses) included in net income			0
Mortgage Servicing Rights Net [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance			1,841
Net income			0
Purchases, assets			0
Settlements, assets			(116)
Net transfers into/(out of) Level 3, assets			0
Ending Balance			1,725
Net unrealized gains/(losses) included in net income			0
Net Derivative Liabilities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		(6,245)	(4,810)
Net income		(1)	(109)
Purchases, liabilities		0	0
Settlements, liabilities		296	299
Net transfers in/(out) level 3, liabilities		0	0
Ending Balance		(5,950)	(4,620)
Net unrealized gains/(losses) included in other expense	[3]	$ (1)	$ (109)

[1] Primarily included in mortgage banking income on the Consolidated Condensed Statements of Income.

[2] Transfers out of loans held-for-sale level 3 measured on a recurring basis generally r eflect movements into real estate acquired by foreclosure (level 3 nonrecurring).

[3] Included in Other expense.