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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 85,147	$ 154,591	$ 80,296	$ 152,501
Total gains or losses (realized /unrealized), included in earnings	(2,814)	887	(3,255)	4,568
Total gains or losses (realized /unrealized), included in other comprehensive income	401	(352)	502	(354)
Investment securities called	0	0	(100)	(2,000)
Discount accretion	69	21	82	151
Purchase of private equity securities	575	1,437	5,841	1,653
Sales And Repayments Of Private Equity Securities	(2,398)	(4,800)	(2,398)	(4,800)
Capitalized interest/dividends	14	52	62	117
Sale Of Risk Participation Agreement	0	0	(36)	0
Ending balance	80,994	151,836	80,994	151,836
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	(2,043)	1,295	(2,992)	4,568
State And Municipal Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	17,209	93,271	17,195	95,143
Total gains or losses (realized /unrealized), included in earnings	0	0	0	0
Total gains or losses (realized /unrealized), included in other comprehensive income	401	(352)	502	(354)
Investment securities called	0	0	(100)	(2,000)
Discount accretion	69	21	82	151
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	17,679	92,940	17,679	92,940
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	67,432	61,162	63,032	57,581
Total gains or losses (realized /unrealized), included in earnings	(2,810)	875	(3,724)	4,175
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	575	1,437	5,841	1,653
Sales And Repayments Of Private Equity Securities	(2,398)	(4,800)	(2,398)	(4,800)
Capitalized interest/dividends	14	52	62	117
Sale Of Risk Participation Agreement	0	0	0	0
Ending balance	62,813	58,726	62,813	58,726
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	(2,810)	875	(3,724)	4,175
Derivative Level Three Unobservable Inputs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	506	158	69	(223)
Total gains or losses (realized /unrealized), included in earnings	(4)	12	469	393
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	(36)	0
Ending balance	502	170	502	170
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	$ 767	$ 420	$ 732	$ 393