Allowance For Loan Losses, Allowance For Losses On Lending-Related Commitments And Impaired Loans (Summary Of The Post-Modification Balance Of Loans Restructured) (Detail) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013 Loan		Jun. 30, 2012 Loan
Troubled debt restructuring modifications, number of count					51	[1],[2]	129	[1],[2]
Restructured loans					$ 28,921,000	[1],[2]	$ 118,360,000	[1],[2]
Financing Receivables, Modifications, Weighted Average Extension Term	16 months		14 months		17 months		8 months
Financing Receivables, Modifications, Weighted Average Interest Only Term	11 months		5 months		11 months		4 months
Loan Forgiveness	0		420,000		50,000		420,000
All Modifications [Member]
Troubled debt restructuring modifications, number of count	12	[1],[3]	19	[1],[3]	26	[1],[3]	50	[1],[3]
Restructured loans	14,468,000	[1],[3]	20,654,000	[1],[3]	16,745,000	[1],[3]	60,337,000	[1],[3]
Extension At Below Market Terms [Member]
Troubled debt restructuring modifications, number of count	10	[1]	15	[1]	21	[1]	43	[1]
Restructured loans	14,092,000	[1]	10,217,000	[1]	15,927,000	[1]	49,677,000	[1]
Reduction Of Interest Rate [Member]
Troubled debt restructuring modifications, number of count	6	[1]	13	[1]	17	[1]	35	[1]
Restructured loans	4,883,000	[1]	18,285,000	[1]	6,989,000	[1]	55,873,000	[1]
Modification To Interest Only Payments [Member]
Troubled debt restructuring modifications, number of count	4	[1]	7	[1]	7	[1]	30	[1]
Restructured loans	6,231,000	[1]	14,011,000	[1]	6,539,000	[1]	47,908,000	[1]
Forgiveness Of Debt [Member]
Troubled debt restructuring modifications, number of count	0	[1]	3	[1]	1	[1]	3	[1]
Restructured loans	0	[1]	1,515,000	[1]	73,000	[1]	1,515,000	[1]
Residential Real Estate And Other [Member]
Troubled debt restructuring modifications, number of count					12	[1],[2]	18	[1],[2]
Restructured loans					1,341,000	[1],[2]	6,397,000	[1],[2]
Residential Real Estate And Other [Member] | All Modifications [Member]
Troubled debt restructuring modifications, number of count	3	[1],[3]	1	[1],[3]	7	[1],[3]	5	[1],[3]
Restructured loans	401,000	[1],[3]	29,000	[1],[3]	778,000	[1],[3]	1,075,000	[1],[3]
Residential Real Estate And Other [Member] | Extension At Below Market Terms [Member]
Troubled debt restructuring modifications, number of count	1	[1]	1	[1]	3	[1]	4	[1]
Restructured loans	25,000	[1]	29,000	[1]	95,000	[1]	956,000	[1]
Residential Real Estate And Other [Member] | Reduction Of Interest Rate [Member]
Troubled debt restructuring modifications, number of count	3	[1]	1	[1]	6	[1]	2	[1]
Restructured loans	401,000	[1]	29,000	[1]	762,000	[1]	147,000	[1]
Residential Real Estate And Other [Member] | Modification To Interest Only Payments [Member]
Troubled debt restructuring modifications, number of count	1	[1]	0	[1]	2	[1]	2	[1]
Restructured loans	111,000	[1]	0	[1]	234,000	[1]	845,000	[1]
Residential Real Estate And Other [Member] | Forgiveness Of Debt [Member]
Troubled debt restructuring modifications, number of count	0	[1]	1	[1]	0	[1]	1	[1]
Restructured loans	0	[1]	29,000	[1]	0	[1]	29,000	[1]
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Troubled debt restructuring modifications, number of count					3	[1],[2]	8	[1],[2]
Restructured loans					6,120,000	[1],[2]	3,827,000	[1],[2]
Commercial Real Estate Portfolio Segment [Member] | Land [Member]
Troubled debt restructuring modifications, number of count					2	[1],[2]	23	[1],[2]
Restructured loans					287,000	[1],[2]	38,296,000	[1],[2]
Commercial Real Estate Portfolio Segment [Member] | Retail Site [Member]
Troubled debt restructuring modifications, number of count					4	[1],[2]	15	[1],[2]
Restructured loans					5,085,000	[1],[2]	26,460,000	[1],[2]
Commercial Real Estate Portfolio Segment [Member] | Multi Family [Member]
Troubled debt restructuring modifications, number of count					2	[1],[2]	6	[1],[2]
Restructured loans					1,085,000	[1],[2]	4,414,000	[1],[2]
Commercial Real Estate Portfolio Segment [Member] | Mixed Use And Other [Member]
Troubled debt restructuring modifications, number of count					11	[1],[2]	25	[1],[2]
Restructured loans					7,230,000	[1],[2]	11,429,000	[1],[2]
Commercial Real Estate Portfolio Segment [Member] | Residential Construction [Member]
Troubled debt restructuring modifications, number of count					1	[1],[2]	3	[1],[2]
Restructured loans					496,000	[1],[2]	2,756,000	[1],[2]
Commercial Real Estate Portfolio Segment [Member] | Office [Member]
Troubled debt restructuring modifications, number of count					3	[1],[2]	2	[1],[2]
Restructured loans					3,465,000	[1],[2]	4,795,000	[1],[2]
Commercial Real Estate Portfolio Segment [Member] | Industrial [Member]
Troubled debt restructuring modifications, number of count					2	[1],[2]	3	[1],[2]
Restructured loans					1,676,000	[1],[2]	2,110,000	[1],[2]
Commercial Real Estate Portfolio Segment [Member] | All Modifications [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Troubled debt restructuring modifications, number of count	3	[1],[3]	0	[1],[3]	3	[1],[3]	2	[1],[3]
Restructured loans	6,120,000	[1],[3]	0	[1],[3]	6,120,000	[1],[3]	622,000	[1],[3]
Commercial Real Estate Portfolio Segment [Member] | All Modifications [Member] | Land [Member]
Troubled debt restructuring modifications, number of count	0	[1],[3]	3	[1],[3]	2	[1],[3]	17	[1],[3]
Restructured loans	0	[1],[3]	3,844,000	[1],[3]	287,000	[1],[3]	31,836,000	[1],[3]
Commercial Real Estate Portfolio Segment [Member] | All Modifications [Member] | Retail Site [Member]
Troubled debt restructuring modifications, number of count	0	[1],[3]	0	[1],[3]	1	[1],[3]	5	[1],[3]
Restructured loans	0	[1],[3]	0	[1],[3]	200,000	[1],[3]	8,633,000	[1],[3]
Commercial Real Estate Portfolio Segment [Member] | All Modifications [Member] | Multi Family [Member]
Troubled debt restructuring modifications, number of count	0	[1],[3]	0	[1],[3]	1	[1],[3]	0	[1],[3]
Restructured loans	0	[1],[3]	0	[1],[3]	705,000	[1],[3]	0	[1],[3]
Commercial Real Estate Portfolio Segment [Member] | All Modifications [Member] | Mixed Use And Other [Member]
Troubled debt restructuring modifications, number of count	2	[1],[3]	3	[1],[3]	2	[1],[3]	6	[1],[3]
Restructured loans	3,533,000	[1],[3]	2,365,000	[1],[3]	3,533,000	[1],[3]	3,637,000	[1],[3]
Commercial Real Estate Portfolio Segment [Member] | All Modifications [Member] | Residential Construction [Member]
Troubled debt restructuring modifications, number of count	0	[1],[3]	2	[1],[3]	0	[1],[3]	2	[1],[3]
Restructured loans	0	[1],[3]	1,651,000	[1],[3]	0	[1],[3]	1,651,000	[1],[3]
Commercial Real Estate Portfolio Segment [Member] | All Modifications [Member] | Office [Member]
Troubled debt restructuring modifications, number of count	3	[1],[3]	0	[1],[3]	3	[1],[3]	0	[1],[3]
Restructured loans	3,465,000	[1],[3]	0	[1],[3]	3,465,000	[1],[3]	0	[1],[3]
Commercial Real Estate Portfolio Segment [Member] | All Modifications [Member] | Industrial [Member]
Troubled debt restructuring modifications, number of count	1	[1],[3]	0	[1],[3]	1	[1],[3]	0	[1],[3]
Restructured loans	949,000	[1],[3]	0	[1],[3]	949,000	[1],[3]	0	[1],[3]
Commercial Real Estate Portfolio Segment [Member] | Extension At Below Market Terms [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Troubled debt restructuring modifications, number of count	3	[1]	0	[1]	3	[1]	2	[1]
Restructured loans	6,120,000	[1]	0	[1]	6,120,000	[1]	622,000	[1]
Commercial Real Estate Portfolio Segment [Member] | Extension At Below Market Terms [Member] | Land [Member]
Troubled debt restructuring modifications, number of count	0	[1]	3	[1]	2	[1]	17	[1]
Restructured loans	0	[1]	3,844,000	[1]	287,000	[1]	31,836,000	[1]
Commercial Real Estate Portfolio Segment [Member] | Extension At Below Market Terms [Member] | Retail Site [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	1	[1]	5	[1]
Restructured loans	0	[1]	0	[1]	200,000	[1]	8,633,000	[1]
Commercial Real Estate Portfolio Segment [Member] | Extension At Below Market Terms [Member] | Multi Family [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	1	[1]	0	[1]
Restructured loans	0	[1]	0	[1]	705,000	[1]	0	[1]
Commercial Real Estate Portfolio Segment [Member] | Extension At Below Market Terms [Member] | Mixed Use And Other [Member]
Troubled debt restructuring modifications, number of count	2	[1]	3	[1]	2	[1]	6	[1]
Restructured loans	3,533,000	[1]	2,365,000	[1]	3,533,000	[1]	3,637,000	[1]
Commercial Real Estate Portfolio Segment [Member] | Extension At Below Market Terms [Member] | Residential Construction [Member]
Troubled debt restructuring modifications, number of count		[1]	2	[1]	0	[1]	2	[1]
Restructured loans	0	[1]	1,651,000	[1]	0	[1]	1,651,000	[1]
Commercial Real Estate Portfolio Segment [Member] | Extension At Below Market Terms [Member] | Office [Member]
Troubled debt restructuring modifications, number of count	3	[1]	0	[1]	3	[1]	0	[1]
Restructured loans	3,465,000	[1]	0	[1]	3,465,000	[1]	0	[1]
Commercial Real Estate Portfolio Segment [Member] | Extension At Below Market Terms [Member] | Industrial [Member]
Troubled debt restructuring modifications, number of count	1	[1]	0	[1]	1	[1]	0	[1]
Restructured loans	949,000	[1]	0	[1]	949,000	[1]	0	[1]
Commercial Real Estate Portfolio Segment [Member] | Reduction Of Interest Rate [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	0	[1]	2	[1]
Restructured loans	0	[1]	0	[1]	0	[1]	622,000	[1]
Commercial Real Estate Portfolio Segment [Member] | Reduction Of Interest Rate [Member] | Land [Member]
Troubled debt restructuring modifications, number of count	0	[1]	2	[1]	2	[1]	14	[1]
Restructured loans	0	[1]	3,557,000	[1]	287,000	[1]	30,561,000	[1]
Commercial Real Estate Portfolio Segment [Member] | Reduction Of Interest Rate [Member] | Retail Site [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	1	[1]	5	[1]
Restructured loans	0	[1]	0	[1]	200,000	[1]	8,633,000	[1]
Commercial Real Estate Portfolio Segment [Member] | Reduction Of Interest Rate [Member] | Multi Family [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	1	[1]	0	[1]
Restructured loans	0	[1]	0	[1]	705,000	[1]	0	[1]
Commercial Real Estate Portfolio Segment [Member] | Reduction Of Interest Rate [Member] | Mixed Use And Other [Member]
Troubled debt restructuring modifications, number of count	2	[1]	2	[1]	2	[1]	4	[1]
Restructured loans	3,533,000	[1]	2,219,000	[1]	3,533,000	[1]	3,430,000	[1]
Commercial Real Estate Portfolio Segment [Member] | Reduction Of Interest Rate [Member] | Residential Construction [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	0	[1]	0	[1]
Restructured loans	0	[1]	0	[1]	0	[1]	0	[1]
Commercial Real Estate Portfolio Segment [Member] | Reduction Of Interest Rate [Member] | Office [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	0	[1]	0	[1]
Restructured loans	0	[1]	0	[1]	0	[1]	0	[1]
Commercial Real Estate Portfolio Segment [Member] | Reduction Of Interest Rate [Member] | Industrial [Member]
Troubled debt restructuring modifications, number of count	1	[1]	0	[1]	1	[1]	0	[1]
Restructured loans	949,000	[1]	0	[1]	949,000	[1]	0	[1]
Commercial Real Estate Portfolio Segment [Member] | Modification To Interest Only Payments [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Troubled debt restructuring modifications, number of count	3	[1]	0	[1]	3	[1]	2	[1]
Restructured loans	6,120,000	[1]	0	[1]	6,120,000	[1]	622,000	[1]
Commercial Real Estate Portfolio Segment [Member] | Modification To Interest Only Payments [Member] | Land [Member]
Troubled debt restructuring modifications, number of count	0	[1]	2	[1]	0	[1]	13	[1]
Restructured loans	0	[1]	3,557,000	[1]	0	[1]	26,511,000	[1]
Commercial Real Estate Portfolio Segment [Member] | Modification To Interest Only Payments [Member] | Retail Site [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	0	[1]	4	[1]
Restructured loans	0	[1]	0	[1]	0	[1]	8,243,000	[1]
Commercial Real Estate Portfolio Segment [Member] | Modification To Interest Only Payments [Member] | Multi Family [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	0	[1]	0	[1]
Restructured loans	0	[1]	0	[1]	0	[1]	0	[1]
Commercial Real Estate Portfolio Segment [Member] | Modification To Interest Only Payments [Member] | Mixed Use And Other [Member]
Troubled debt restructuring modifications, number of count	0	[1]	1	[1]	0	[1]	3	[1]
Restructured loans	0	[1]	146,000	[1]	0	[1]	1,275,000	[1]
Commercial Real Estate Portfolio Segment [Member] | Modification To Interest Only Payments [Member] | Residential Construction [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	0	[1]	0	[1]
Restructured loans	0	[1]	0	[1]	0	[1]	0	[1]
Commercial Real Estate Portfolio Segment [Member] | Modification To Interest Only Payments [Member] | Office [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	0	[1]	0	[1]
Restructured loans	0	[1]	0	[1]	0	[1]	0	[1]
Commercial Real Estate Portfolio Segment [Member] | Modification To Interest Only Payments [Member] | Industrial [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	0	[1]	0	[1]
Restructured loans	0	[1]	0	[1]	0	[1]	0	[1]
Commercial Real Estate Portfolio Segment [Member] | Forgiveness Of Debt [Member] | Commercial Real Estate Construction Financing Receivable [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	0	[1]	0	[1]
Restructured loans	0	[1]	0	[1]	0	[1]	0	[1]
Commercial Real Estate Portfolio Segment [Member] | Forgiveness Of Debt [Member] | Land [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	1	[1]	0	[1]
Restructured loans	0	[1]	0	[1]	73,000	[1]	0	[1]
Commercial Real Estate Portfolio Segment [Member] | Forgiveness Of Debt [Member] | Retail Site [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	0	[1]	0	[1]
Restructured loans	0	[1]	0	[1]	0	[1]	0	[1]
Commercial Real Estate Portfolio Segment [Member] | Forgiveness Of Debt [Member] | Multi Family [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	0	[1]	0	[1]
Restructured loans	0	[1]	0	[1]	0	[1]	0	[1]
Commercial Real Estate Portfolio Segment [Member] | Forgiveness Of Debt [Member] | Mixed Use And Other [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	0	[1]	0	[1]
Restructured loans	0	[1]	0	[1]	0	[1]	0	[1]
Commercial Real Estate Portfolio Segment [Member] | Forgiveness Of Debt [Member] | Residential Construction [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	0	[1]	0	[1]
Restructured loans	0	[1]	0	[1]	0	[1]	0	[1]
Commercial Real Estate Portfolio Segment [Member] | Forgiveness Of Debt [Member] | Office [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	0	[1]	0	[1]
Restructured loans	0	[1]	0	[1]	0	[1]	0	[1]
Commercial Real Estate Portfolio Segment [Member] | Forgiveness Of Debt [Member] | Industrial [Member]
Troubled debt restructuring modifications, number of count	0	[1]	0	[1]	0	[1]	0	[1]
Restructured loans	0	[1]	0	[1]	0	[1]	0	[1]
Commercial Portfolio Segment [Member] | Commercial And Industrial [Member]
Troubled debt restructuring modifications, number of count					11	[1],[2]	26	[1],[2]
Restructured loans					2,136,000	[1],[2]	17,876,000	[1],[2]
Commercial Portfolio Segment [Member] | All Modifications [Member] | Commercial And Industrial [Member]
Troubled debt restructuring modifications, number of count	0	[1],[3]	10	[1],[3]	6	[1],[3]	13	[1],[3]
Restructured loans	0	[1],[3]	12,765,000	[1],[3]	708,000	[1],[3]	12,883,000	[1],[3]
Commercial Portfolio Segment [Member] | Extension At Below Market Terms [Member] | Commercial And Industrial [Member]
Troubled debt restructuring modifications, number of count	0	[1]	6	[1]	5	[1]	7	[1]
Restructured loans	0	[1]	2,328,000	[1]	573,000	[1]	2,342,000	[1]
Commercial Portfolio Segment [Member] | Reduction Of Interest Rate [Member] | Commercial And Industrial [Member]
Troubled debt restructuring modifications, number of count	0	[1]	8	[1]	4	[1]	8	[1]
Restructured loans	0	[1]	12,480,000	[1]	553,000	[1]	12,480,000	[1]
Commercial Portfolio Segment [Member] | Modification To Interest Only Payments [Member] | Commercial And Industrial [Member]
Troubled debt restructuring modifications, number of count	0	[1]	4	[1]	2	[1]	6	[1]
Restructured loans	0	[1]	10,308,000	[1]	185,000	[1]	10,412,000	[1]
Commercial Portfolio Segment [Member] | Forgiveness Of Debt [Member] | Commercial And Industrial [Member]
Troubled debt restructuring modifications, number of count	0	[1]	2	[1]	0	[1]	2	[1]
Restructured loans	$ 0	[1]	$ 1,486,000	[1]	$ 0	[1]	$ 1,486,000	[1]

[1] Balances represent the recorded investment in the loan at the time of the restructuring.

[2] Total TDRs represent all loans restructured in TDRs during the previous twelve months from the date indicated.

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