Allowance For Loan Losses, Allowance For Losses On Lending-Related Commitments And Impaired Loans (Summary Of Subsequently Defaulted Under Restructured Terms) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended				12 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Count	26	[1]	31	[1]	70	[1]	91	[1]	91		132
Balance	$ 13,473	[1]	$ 24,074	[1]	$ 55,976	[1]	$ 80,031	[1]	$ 73,838		$ 112,463
Commercial [Member] | Commercial And Industrial [Member] | Payment In Default [Member]
Count									5	[2]	5	[2]
Balance									1,946	[2]	4,632	[2]
Commercial [Member] | Other [Member] | Payment In Default [Member]
Count		[2]		[2]
Balance		[2]		[2]
Commercial Real-Estate [Member] | Residential Construction [Member] | Payment In Default [Member]
Count		[2]		[2]							3	[2]
Balance		[2]		[2]							4,478	[2]
Commercial Real-Estate [Member] | Commercial Construction [Member] | Payment In Default [Member]
Count			1	[2]					1	[2]	1	[2]
Balance			981	[2]					377	[2]	981	[2]
Commercial Real-Estate [Member] | Land [Member] | Payment In Default [Member]
Count	1	[2]	1	[2]					3	[2]	2	[2]
Balance	156	[2]	347	[2]					4,227	[2]	6,533	[2]
Commercial Real-Estate [Member] | Office [Member] | Payment In Default [Member]
Count									3	[2]	2	[2]
Balance									3,899	[2]	2,200	[2]
Commercial Real-Estate [Member] | Industrial [Member] | Payment In Default [Member]
Count									1	[2]	1	[2]
Balance									1,840	[2]	1,502	[2]
Commercial Real-Estate [Member] | Retail [Member] | Payment In Default [Member]
Count			1	[2]					1	[2]	3	[2]
Balance			1,088	[2]					459	[2]	4,332	[2]
Commercial Real-Estate [Member] | Multi-Family [Member] | Payment In Default [Member]
Count			1	[2]							12	[2]
Balance			1,232	[2]							10,911	[2]
Commercial Real-Estate [Member] | Mixed Use And Other [Member] | Payment In Default [Member]
Count	1	[2]							4	[2]	8	[2]
Balance	339	[2]							1,852	[2]	4,851	[2]
Payment In Default [Member]
Count	3	[2]	4	[2]					21	[2]	40	[2]
Balance	636	[2]	3,648	[2]					15,369	[2]	42,590	[2]
Payment In Default [Member] | Residential Real Estate And Other [Member]
Count	1	[2]							3	[2]	3	[2]
Balance	141	[2]							769	[2]	2,170	[2]
Commercial [Member] | Commercial And Industrial [Member]
Count	8	[1]	10	[1]	19	[1]	23	[1]	32		33
Balance	3,157	[1]	2,797	[1]	5,119	[1]	8,094	[1]	11,941		15,117
Commercial [Member] | Other [Member]
Count											1
Balance											3,923
Commercial Real-Estate [Member] | Residential Construction [Member]
Count		[1]		[1]		[1]	8	[1]			11
Balance		[1]		[1]		[1]	8,503	[1]			11,596
Commercial Real-Estate [Member] | Commercial Construction [Member]
Count	1	[1]	2	[1]	3	[1]	2	[1]	4		2
Balance	467	[1]	1,628	[1]	9,402	[1]	1,628	[1]	9,779		1,628
Commercial Real-Estate [Member] | Land [Member]
Count	2	[1]	2	[1]	3	[1]	11	[1]	4		12
Balance	436	[1]	861	[1]	1,947	[1]	15,894	[1]	4,507		18,585
Commercial Real-Estate [Member] | Office [Member]
Count		[1]	3	[1]	7	[1]	5	[1]	9		9
Balance		[1]	3,103	[1]	4,075	[1]	6,334	[1]	8,906		8,959
Commercial Real-Estate [Member] | Industrial [Member]
Count	1	[1]	2	[1]	3	[1]	3	[1]	3		4
Balance	797	[1]	3,149	[1]	4,021	[1]	3,386	[1]	4,020		4,888
Commercial Real-Estate [Member] | Retail [Member]
Count	2	[1]	3	[1]	6	[1]	11	[1]	6		14
Balance	3,016	[1]	3,141	[1]	4,302	[1]	10,746	[1]	4,302		14,528
Commercial Real-Estate [Member] | Multi-Family [Member]
Count	1	[1]	3	[1]	1	[1]	9	[1]	1		18
Balance	548	[1]	2,644	[1]	548	[1]	8,808	[1]	548		13,668
Commercial Real-Estate [Member] | Mixed Use And Other [Member]
Count	5	[1]	6	[1]	19	[1]	16	[1]	22		24
Balance	2,195	[1]	6,751	[1]	23,111	[1]	13,811	[1]	25,941		16,509
Residential Real Estate And Other [Member]
Count	6	[1]		[1]	9	[1]	3	[1]	10		4
Balance	$ 2,857	[1]		[1]	$ 3,451	[1]	$ 2,827	[1]	$ 3,894		$ 3,062

[1] Restructured loans may have more than one modification representing a concession. As such, restructured loans during the period may be represented in more than one of the categories noted above.

[2] Restructured loans considered to be in payment default are over 30 days past-due subsequent to the restructuring.