Allowance For Loan Losses, Allowance For Losses On Lending-Related Commitments And Impaired Loans (Summary Of Loans Restructured Which Represent Troubled Debt Restructuring) (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] | Extension At Below Market Terms [Member]
Count			10		8		19
Balance			2,797		859		5,973
Commercial Real-Estate [Member] | Residential Construction [Member] | Extension At Below Market Terms [Member]
Count							6
Balance							6,760
Commercial Real-Estate [Member] | Commercial Construction [Member] | Extension At Below Market Terms [Member]
Count			2		2		2
Balance			1,628		8,935		1,628
Commercial Real-Estate [Member] | Land [Member] | Extension At Below Market Terms [Member]
Count	2		2		3		10
Balance	436		861		1,947		15,799
Commercial Real-Estate [Member] | Office [Member] | Extension At Below Market Terms [Member]
Count			2		5		3
Balance			631		2,740		3,304
Commercial Real-Estate [Member] | Industrial [Member] | Extension At Below Market Terms [Member]
Count	1		2		3		3
Balance	797		3,149		4,021		3,386
Commercial Real-Estate [Member] | Retail [Member] | Extension At Below Market Terms [Member]
Count	2		1		4		4
Balance	3,016		871		3,775		3,186
Commercial Real-Estate [Member] | Multi-Family [Member] | Extension At Below Market Terms [Member]
Count	1		3		1		7
Balance	548		2,644		548		4,191
Commercial Real-Estate [Member] | Mixed Use And Other [Member] | Extension At Below Market Terms [Member]
Count	1		4		12		6
Balance	155		3,990		11,851		4,387
Extension At Below Market Terms [Member]
Count	12		26		45		62
Balance	6,869		16,571		37,002		51,205
Extension At Below Market Terms [Member] | Residential Real Estate And Other [Member]
Count	5				7		2
Balance	1,917				2,326		2,591
Commercial [Member] | Commercial And Industrial [Member] | Reduction Of Interest Rate [Member]
Count	2		3		10		5
Balance	412		1,603		1,271		3,452
Commercial Real-Estate [Member] | Residential Construction [Member] | Reduction Of Interest Rate [Member]
Count							3
Balance							4,863
Commercial Real-Estate [Member] | Commercial Construction [Member] | Reduction Of Interest Rate [Member]
Count	1				3
Balance	467				9,402
Commercial Real-Estate [Member] | Land [Member] | Reduction Of Interest Rate [Member]
Count	1				1		2
Balance	280				280		2,716
Commercial Real-Estate [Member] | Office [Member] | Reduction Of Interest Rate [Member]
Count			2		5		3
Balance			2,547		1,997		3,105
Commercial Real-Estate [Member] | Industrial [Member] | Reduction Of Interest Rate [Member]
Count	1		2		2		2
Balance	797		3,149		2,181		3,149
Commercial Real-Estate [Member] | Retail [Member] | Reduction Of Interest Rate [Member]
Count	1		1		4		7
Balance	2,235		871		3,251		6,811
Commercial Real-Estate [Member] | Multi-Family [Member] | Reduction Of Interest Rate [Member]
Count							5
Balance							5,735
Commercial Real-Estate [Member] | Mixed Use And Other [Member] | Reduction Of Interest Rate [Member]
Count	3		3		14		12
Balance	541		3,880		20,324		9,781
Reduction Of Interest Rate [Member]
Count	13		11		45		41
Balance	7,066		12,050		41,502		40,739
Reduction Of Interest Rate [Member] | Residential Real Estate And Other [Member]
Count	4				6		2
Balance	2,334				2,796		1,127
Commercial [Member] | Commercial And Industrial [Member] | Modification To Interest- Only Payments [Member]
Count	6		4		10		12
Balance	2,745		585		3,327		4,226
Commercial Real-Estate [Member] | Residential Construction [Member] | Modification To Interest- Only Payments [Member]
Count
Balance
Commercial Real-Estate [Member] | Commercial Construction [Member] | Modification To Interest- Only Payments [Member]
Count	1				1
Balance	467				467
Commercial Real-Estate [Member] | Land [Member] | Modification To Interest- Only Payments [Member]
Count			1				5
Balance			514				2,911
Commercial Real-Estate [Member] | Office [Member] | Modification To Interest- Only Payments [Member]
Count			2		2		4
Balance			3,028		1,536		6,259
Commercial Real-Estate [Member] | Industrial [Member] | Modification To Interest- Only Payments [Member]
Count	1		1		2		2
Balance	797		449		2,181		686
Commercial Real-Estate [Member] | Retail [Member] | Modification To Interest- Only Payments [Member]
Count	2		2		4		8
Balance	3,016		2,270		3,586		8,138
Commercial Real-Estate [Member] | Multi-Family [Member] | Modification To Interest- Only Payments [Member]
Count							6
Balance							6,163
Commercial Real-Estate [Member] | Mixed Use And Other [Member] | Modification To Interest- Only Payments [Member]
Count	2		3		4		9
Balance	1,654		4,495		6,803		9,165
Modification To Interest- Only Payments [Member]
Count	14		13		27		47
Balance	9,607		11,341		19,290		38,439
Modification To Interest- Only Payments [Member] | Residential Real Estate And Other [Member]
Count	2				4		1
Balance	928				1,390		891
Commercial [Member] | Commercial And Industrial [Member] | Forgiveness Of Debt [Member]
Count					2		1
Balance					135		1,050
Commercial Real-Estate [Member] | Residential Construction [Member] | Forgiveness Of Debt [Member]
Count							2
Balance							1,743
Commercial Real-Estate [Member] | Commercial Construction [Member] | Forgiveness Of Debt [Member]
Count
Balance
Commercial Real-Estate [Member] | Land [Member] | Forgiveness Of Debt [Member]
Count
Balance
Commercial Real-Estate [Member] | Office [Member] | Forgiveness Of Debt [Member]
Count
Balance
Commercial Real-Estate [Member] | Industrial [Member] | Forgiveness Of Debt [Member]
Count
Balance
Commercial Real-Estate [Member] | Retail [Member] | Forgiveness Of Debt [Member]
Count
Balance
Commercial Real-Estate [Member] | Multi-Family [Member] | Forgiveness Of Debt [Member]
Count			3				3
Balance			2,644				2,644
Commercial Real-Estate [Member] | Mixed Use And Other [Member] | Forgiveness Of Debt [Member]
Count			1				1
Balance			250				250
Forgiveness Of Debt [Member]
Count			4		2		7
Balance			2,894		135		5,687
Forgiveness Of Debt [Member] | Residential Real Estate And Other [Member]
Count
Balance
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 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.