Fair Value Measurements (Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 184,271,000	$ 194,394,000
Total gains or losses (realized /unrealized), included in earnings	16,899,000	(1,719,000)
Total gains or losses (realized /unrealized), included in other comprehensive income	(784,000)	2,188,000
Investment securities called	0	(525,000)
Discount accretion	39,000	66,000
Purchase of private equity securities	3,000,000	1,650,000
Sales And Repayments Of Private Equity Securities	(14,000)	0
Capitalized interest/dividends	54,000	61,000
Sale Of Risk Participation Agreement	(107,000)	0
Ending balance	203,358,000	196,115,000
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	16,899,000	(1,719,000)
State And Municipal Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	127,724,000	126,414,000
Total gains or losses (realized /unrealized), included in earnings	0	0
Total gains or losses (realized /unrealized), included in other comprehensive income	(784,000)	2,188,000
Investment securities called	0	(525,000)
Discount accretion	39,000	66,000
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	126,979,000	128,143,000
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	56,612,000	68,167,000
Total gains or losses (realized /unrealized), included in earnings	16,794,000	(1,775,000)
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	3,000,000	1,650,000
Sales And Repayments Of Private Equity Securities	(14,000)	0
Capitalized interest/dividends	54,000	61,000
Sale Of Risk Participation Agreement	0	0
Ending balance	76,446,000	68,103,000
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	16,794,000	(1,775,000)
Derivative Level Three Unobservable Inputs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	(65,000)	(187,000)
Total gains or losses (realized /unrealized), included in earnings	105,000	56,000
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	(107,000)	0
Ending balance	(67,000)	(131,000)
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	$ 105,000	$ 56,000