Fair Value Measurements (Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 196,115	$ 201,888	$ 194,394	$ 202,476
Total gains or losses (realized /unrealized), included in earnings	367	1,482	(1,352)	5,596
Total gains or losses (realized /unrealized), included in other comprehensive income	(1,072)	520	1,116	(4,938)
Investment securities called	(375)	(3,000)	(900)	(3,350)
Discount accretion	57	147	123	207
Purchase of private equity securities	2,000	0	3,650	3,275
Sales And Repayments Of Private Equity Securities	(7,184)	(7,845)	(7,184)	(10,279)
Capitalized interest/dividends	62	15	123	192
Purchase of risk participation agreement	0	0	0	28
Sale Of Risk Participation Agreement	(31)	0	(31)	0
Ending balance	189,939	193,207	189,939	193,207
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	367	607	(1,352)	4,580
State And Municipal Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	128,143	129,873	126,414	135,621
Total gains or losses (realized /unrealized), included in earnings	0	0	0	0
Total gains or losses (realized /unrealized), included in other comprehensive income	(1,072)	520	1,116	(4,938)
Investment securities called	(375)	(3,000)	(900)	(3,350)
Discount accretion	57	147	123	207
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
Purchase of risk participation agreement	0	0	0	0
Sale Of Risk Participation Agreement	0	0	0	0
Ending balance	126,753	127,540	126,753	127,540
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	68,103	72,121	68,167	66,978
Total gains or losses (realized /unrealized), included in earnings	298	1,475	(1,477)	5,600
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	2,000	0	3,650	3,275
Sales And Repayments Of Private Equity Securities	(7,184)	(7,845)	(7,184)	(10,279)
Capitalized interest/dividends	62	15	123	192
Purchase of risk participation agreement	0	0	0	0
Sale Of Risk Participation Agreement	0	0	0	0
Ending balance	63,279	65,766	63,279	65,766
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	298	600	(1,477)	4,575
Derivative Level Three Unobservable Inputs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	(131)	(106)	(187)	(123)
Total gains or losses (realized /unrealized), included in earnings	69	7	125	(4)
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
Purchase of risk participation agreement	0	0	0	28
Sale Of Risk Participation Agreement	(31)	0	(31)	0
Ending balance	(93)	(99)	(93)	(99)
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	$ 69	$ 7	$ 125	$ 5