Fair Value Accounting (Changes In Level 3 Fair Value Measurements) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Other Liabilities [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance, January 1,	$ 0
Included in earnings	0
Unrealized gains included in other comprehensive income	0
Additions	(14,000)
Sales	0
Issuances	0
Settlements	0
Transfers in and/or out of Level 3	0
Ending balance, December 31,	(14,000)	$ 0
Total net (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at December 31,	0
Visa Derivative [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance, January 1,	(1,415)	(1,401)
Included in earnings	(5,795)	(1,464)
Unrealized gains included in other comprehensive income	0	0
Additions	0	0
Sales	0	0
Issuances	0	0
Settlements	1,442	1,450
Amortization of discount/premium	0	0
Transfers in and/or out of Level 3	0	0
Ending balance, December 31,	(5,768)	(1,415)
Total net (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at December 31,	(5,795)	(1,464)
Investment Securities Available For Sale [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance, January 1,	1,745	1,645
Included in earnings	0	0
Unrealized gains included in other comprehensive income	51	100
Additions	0	0
Sales	0	0
Issuances	0	0
Settlements	0	0
Amortization of discount/premium	0	0
Transfers in and/or out of Level 3	0	0
Ending balance, December 31,	1,796	1,745
Total net (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at December 31,	0	0
Private Equity Investments [Member]
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance, January 1,	27,148	27,367
Included in earnings	(1,026)	(219)
Unrealized gains included in other comprehensive income	0	0
Additions	0	0
Sales	0	0
Issuances	0	0
Settlements	(629)	0
Amortization of discount/premium	0	0
Transfers in and/or out of Level 3	0	0
Ending balance, December 31,	25,493	27,148
Total net (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at December 31,	$ (1,026)	$ (219)