Fair Value Measurements (Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 80,296	$ 152,501
Total gains or losses (realized /unrealized), included in earnings	(441)	3,681
Total gains or losses (realized /unrealized), included in other comprehensive income	101	(2)
Investment securities called	(100)	(2,000)
Discount accretion	13	130
Purchase of private equity securities	5,266	216
Capitalized interest/dividends	48	65
Sale Of Risk Participation Agreement	(36)	0
Ending balance	85,147	154,591
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	(178)	3,681
State And Municipal Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	17,195	95,143
Total gains or losses (realized /unrealized), included in earnings	0	0
Total gains or losses (realized /unrealized), included in other comprehensive income	101	(2)
Investment securities called	(100)	(2,000)
Discount accretion	13	130
Purchase of private equity securities	0	0
Capitalized interest/dividends	0	0
Sale Of Risk Participation Agreement	0	0
Ending balance	17,209	93,271
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	63,032	57,581
Total gains or losses (realized /unrealized), included in earnings	(914)	3,300
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	5,266	216
Capitalized interest/dividends	48	65
Sale Of Risk Participation Agreement	0	0
Ending balance	67,432	61,162
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	(914)	3,300
Derivative Level Three Unobservable Inputs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	69	(223)
Total gains or losses (realized /unrealized), included in earnings	473	381
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
Capitalized interest/dividends	0	0
Sale Of Risk Participation Agreement	(36)	0
Ending balance	506	158
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	$ 736	$ 381