Fair Value Measurements (Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 152,501	$ 184,271
Total gains or losses (realized /unrealized), included in earnings	3,681	16,899
Total gains or losses (realized /unrealized), included in other comprehensive income	(2)	(784)
Investment securities called	(2,000)	0
Discount accretion	130	39
Purchase of private equity securities	216	3,000
Sales And Repayments Of Private Equity Securities	0	(14)
Capitalized interest/dividends	65	54
Sale Of Risk Participation Agreement	0	(107)
Ending balance	154,591	203,358
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	3,681	16,899
State And Municipal Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	95,143	127,724
Total gains or losses (realized /unrealized), included in earnings	0	0
Total gains or losses (realized /unrealized), included in other comprehensive income	(2)	(784)
Investment securities called	(2,000)	0
Discount accretion	130	39
Purchase of private equity securities	0	0
Sales And Repayments Of Private Equity Securities	0	0
Capitalized interest/dividends	0	0
Sale Of Risk Participation Agreement	0	0
Ending balance	93,271	126,979
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	0	0
Private Equity Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	57,581	56,612
Total gains or losses (realized /unrealized), included in earnings	3,300	16,794
Total gains or losses (realized /unrealized), included in other comprehensive income	0	0
Investment securities called	0	0
Discount accretion	0	0
Purchase of private equity securities	216	3,000
Sales And Repayments Of Private Equity Securities	0	(14)
Capitalized interest/dividends	65	54
Sale Of Risk Participation Agreement	0	0
Ending balance	61,162	76,446
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	3,300	16,794
Derivative Level Three Unobservable Inputs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	(223)	(65)
Total gains or losses (realized /unrealized), included in earnings	381	105
Total gains or losses (realized /unrealized), included in other comprehensive income	0	0
Investment securities called	0	0
Discount accretion	0	0
Purchase of private equity securities	0	0
Sales And Repayments Of Private Equity Securities	0	0
Capitalized interest/dividends	0	0
Sale Of Risk Participation Agreement	0	(107)
Ending balance	158	(67)
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	$ 381	$ 105