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, 2017	Mar. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 67,760	$ 80,296
Total gains or losses (realized /unrealized), included in earnings	(2,314)	(441)
Total gains or losses (realized /unrealized), included in other comprehensive income	391	101
Investment securities called	0	(100)
Discount accretion	10	13
Purchase of private equity securities	4,825	5,266
Capitalized interest/dividends	33	48
Sale Of Risk Participation Agreement	0	(36)
Ending balance	70,705	85,147
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	(1,965)	(178)
State And Municipal Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	16,682	17,195
Total gains or losses (realized /unrealized), included in earnings	0	0
Total gains or losses (realized /unrealized), included in other comprehensive income	391	101
Investment securities called	0	(100)
Discount accretion	10	13
Purchase of private equity securities	0	0
Capitalized interest/dividends	0	0
Sale Of Risk Participation Agreement	0	0
Ending balance	17,083	17,209
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	50,820	63,032
Total gains or losses (realized /unrealized), included in earnings	(2,878)	(914)
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	4,825	5,266
Capitalized interest/dividends	33	48
Sale Of Risk Participation Agreement	0	0
Ending balance	52,800	67,432
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	(2,878)	(914)
Derivative Level Three Unobservable Inputs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	258	69
Total gains or losses (realized /unrealized), included in earnings	564	473
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	0	(36)
Ending balance	822	506
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	$ 913	$ 736