Fair Value Accounting (Changes In Level 3 Fair Value Measurements) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Investment Securities Available for Sale [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 1,745	$ 1,645
Included in earnings	0	0
Unrealized gains (losses) included in other comprehensive income	(107)	9
Settlements	0	0
Ending balance	1,638	1,654
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
Private Equity Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	27,148	27,367
Included in earnings	(391)	(286)
Unrealized gains (losses) included in other comprehensive income	0	0
Settlements	0	0
Ending balance	26,757	27,081
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,	(391)	(286)
Visa Derivative [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(1,415)	(1,401)
Included in earnings	(360)	(375)
Unrealized gains (losses) included in other comprehensive income	0	0
Settlements	360	351
Ending balance	(1,415)	(1,425)
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,	$ (360)	$ (375)