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		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 189,939	$ 193,207	$ 194,394	$ 202,476
Total gains or losses (realized /unrealized), included in earnings	916	2,775	(436)	8,371
Total gains or losses (realized /unrealized), included in other comprehensive income	(1,772)	3,015	(656)	(1,923)
Investment securities called	0	(3,000)	(900)	(6,350)
Discount accretion	41	176	164	383
Purchase of private equity securities	300	0	3,950	3,275
Sales And Repayments Of Private Equity Securities	0	(1,614)	(7,184)	(11,893)
Capitalized interest/dividends	63	118	186	310
Purchase of risk participation agreement	0	0	0	28
Sale Of Risk Participation Agreement	(41)	(68)	(72)	(68)
Ending balance	189,446	194,609	189,446	194,609
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	916	2,737	(436)	6,909
State And Municipal Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	126,753	127,540	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	(1,772)	3,015	(656)	(1,923)
Investment securities called	0	(3,000)	(900)	(6,350)
Discount accretion	41	176	164	383
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	125,022	127,731	125,022	127,731
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	63,279	65,766	68,167	66,978
Total gains or losses (realized /unrealized), included in earnings	865	2,774	(612)	8,374
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	300	0	3,950	3,275
Sales And Repayments Of Private Equity Securities	0	(1,614)	(7,184)	(11,893)
Capitalized interest/dividends	63	118	186	310
Purchase of risk participation agreement	0	0	0	0
Sale Of Risk Participation Agreement	0	0	0	0
Ending balance	64,507	67,044	64,507	67,044
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	865	2,774	(612)	6,949
Derivative Level Three Unobservable Inputs [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	(93)	(99)	(187)	(123)
Total gains or losses (realized /unrealized), included in earnings	51	1	176	(3)
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	(41)	(68)	(72)	(68)
Ending balance	(83)	(166)	(83)	(166)
Total gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end	$ 51	$ (37)	$ 176	$ (40)