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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 70,705	$ 85,147	$ 67,760	$ 80,296
Total gains or losses (realized /unrealized), included in earnings	17	(2,814)	(2,297)	(3,255)
Total gains or losses (realized /unrealized), included in other comprehensive income	319	401	710	502
Investment securities called	(600)	0	(600)	(100)
Discount accretion	23	69	33	82
Purchase of private equity securities	2,259	575	7,084	5,841
Sales And Repayments Of Private Equity Securities	(1,550)	(2,398)	(1,550)	(2,398)
Capitalized interest/dividends	0	14	33	62
Sale Of Risk Participation Agreement	0	0	0	(36)
Ending balance	71,173	80,994	71,173	80,994
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	920	(2,043)	(1,773)	(2,992)
State And Municipal Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	17,083	17,209	16,682	17,195
Total gains or losses (realized /unrealized), included in earnings	0	0	0	0
Total gains or losses (realized /unrealized), included in other comprehensive income	319	401	710	502
Investment securities called	(600)	0	(600)	(100)
Discount accretion	23	69	33	82
Purchase of private equity securities	0	0	0	0
Sales And Repayments Of Private Equity Securities	0	0	0	0
Capitalized interest/dividends	0	0	0	0
Sale Of Risk Participation Agreement	0	0	0	0
Ending balance	16,825	17,679	16,825	17,679
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	0	0
Private Equity Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	52,800	67,432	50,820	63,032
Total gains or losses (realized /unrealized), included in earnings	48	(2,810)	(2,830)	(3,724)
Total gains or losses (realized /unrealized), included in other comprehensive income	0	0	0	0
Investment securities called	0	0	0	0
Discount accretion	0	0	0	0
Purchase of private equity securities	2,259	575	7,084	5,841
Sales And Repayments Of Private Equity Securities	(1,550)	(2,398)	(1,550)	(2,398)
Capitalized interest/dividends	0	14	33	62
Sale Of Risk Participation Agreement	0	0	0	0
Ending balance	53,557	62,813	53,557	62,813
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	48	(2,810)	(2,655)	(3,724)
Derivative Level Three Unobservable Inputs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	822	506	258	69
Total gains or losses (realized /unrealized), included in earnings	(31)	(4)	533	469
Total gains or losses (realized /unrealized), included in other comprehensive income	0	0	0	0
Investment securities called	0	0	0	0
Discount accretion	0	0	0	0
Purchase of private equity securities	0	0	0	0
Sales And Repayments Of Private Equity Securities	0	0	0	0
Capitalized interest/dividends	0	0	0	0
Sale Of Risk Participation Agreement	0	0	0	(36)
Ending balance	791	502	791	502
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	$ 872	$ 767	$ 882	$ 732