Fair Value Accounting (Changes In Level 3 Fair Value Measurements) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Investment Securities Available for Sale [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 1,700	$ 1,866	$ 1,645	$ 2,350
Included in earnings	0	0	0	(88)
Unrealized gains (losses) included in other comprehensive income	(169)	(81)	(114)	63
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	0	0	0	(540)
Amortization of discount/premium	0	0	0	0
Transfers in and/or out of Level 3	0	0	0	0
Ending balance	1,531	1,785	1,531	1,785
Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at September 30,	0	0	0	(88)
Private Equity Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	26,959	27,376	27,367	27,745
Included in earnings	(109)	(144)	(517)	(513)
Unrealized gains (losses) included in other comprehensive income	0	0	0	0
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	0	0	0	0
Amortization of discount/premium	0	0	0	0
Transfers in and/or out of Level 3	0	0	0	0
Ending balance	26,850	27,232	26,850	27,232
Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at September 30,	(109)	(144)	(517)	(513)
Visa Derivative [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(1,415)	(2,438)	(1,401)
Included in earnings	(363)	(1,979)	(1,092)
Unrealized gains (losses) included in other comprehensive income	0	0	0
Purchases	0	0	0
Sales	0	0	0
Issuances	0	0	0
Settlements	363	396	1,078
Amortization of discount/premium	0	0	0
Transfers in and/or out of Level 3	0	0	0
Ending balance	(1,415)	(4,021)	(1,415)	(4,021)
Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at September 30,	$ (363)	(1,979)	$ (1,092)
Other Derivative Contracts, Net [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance				(2,706)
Included in earnings				(2,731)
Unrealized gains (losses) included in other comprehensive income				0
Purchases				0
Sales				0
Issuances				0
Settlements				1,416
Amortization of discount/premium				0
Transfers in and/or out of Level 3				0
Ending balance		$ (4,021)		(4,021)
Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at September 30,				$ (2,731)