Fair Value Accounting (Changes In Level 3 Fair Value Measurements) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Investment Securities Available for Sale [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 3,312		$ 5,085		$ 3,178		$ 6,842
Included in earnings	0	[1]	0	[1]	0	[1]	(450)	[1]
Unrealized gains (losses) included in other comprehensive income	142		18		276		(788)
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		(501)
Ending balance	3,454		5,103		3,454		5,103
The amount of total net gains (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at March 31, 2012	0		0		0		(450)
Private Equity Investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	30,451		22,568		30,708		21,418
Included in earnings	(883)	[1]	7,279	[1]	(1,140)	[1]	7,372	[1]
Unrealized gains (losses) included in other comprehensive income	0		0		0		0
Purchases	0		0	[2]	0		1,057	[2]
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	29,568		29,847		29,568		29,847
The amount of total net gains (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at March 31, 2012	(883)		7,279		(1,140)		7,372
Other Derivative Contracts, Net [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	(2,610)	[3]	(1,719)	[3]	(2,956)	[3]	(7,242)	[3]
Included in earnings	(764)	[1],[3]	(1,734)	[1],[3]	(801)	[1],[3]	(4,713)	[1],[3]
Unrealized gains (losses) included in other comprehensive income	0	[3]	0	[3]	0	[3]	0	[3]
Purchases	0	[3]	0	[3]	0	[3]	0	[3]
Sales	0		0	[3]	0		0	[3]
Issuances	0		0		0		0
Settlements	397	[3]	403	[3]	780	[3]	10,756	[3]
Amortization of discount/premium	0		0		0		0
Transfers in and/or out of Level 3	0	[3]	0	[3]	0	[3]	(1,851)	[3]
Ending balance	(2,977)	[3]	(3,050)	[3]	(2,977)	[3]	(3,050)	[3]
The amount of total net gains (losses) for the year included in earnings attributable to the change in unrealized gains (losses) relating to assets still held at March 31, 2012	$ (764)	[3]	$ (1,734)	[3]	$ (801)	[3]	$ (4,713)	[3]

[1] Included in earnings as a component of other non-interest income (expense).

[2] Represents additional capital contributed to a private equity investment fund for capital calls. There are no such calls outstanding as of June 30, 2013.

[3]