Loans And Leases (Loans And Leases Modified As TDRs Within Previous Twelve Months And For Which There Was A Payment Default In Period) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012 loan	Sep. 30, 2011 loan	Sep. 30, 2012 loan	Sep. 30, 2011 loan
Financing Receivable, Impaired [Line Items]
Financing Receivable Modifications Contracts Number	3	19	7	29
Financing Receivable Modifications Investment Recorded	$ 93	$ 3,001	$ 1,053	$ 3,917
1-4 Family [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable Modifications Contracts Number		7	1	9
Financing Receivable Modifications Investment Recorded	0	1,296	406	1,833
Permanent-NCLC [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable Modifications Investment Recorded		0		0
Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable Modifications Contracts Number		9	3	13
Financing Receivable Modifications Investment Recorded	0	825	554	841
Liquidating Portfolio-Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable Modifications Contracts Number	3	0	3	2
Financing Receivable Modifications Investment Recorded	93	0	93	3
Commercial Non-Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable Modifications Contracts Number		1		2
Financing Receivable Modifications Investment Recorded		91		182
Asset-Based Loans [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable Modifications Contracts Number		1		1
Financing Receivable Modifications Investment Recorded				381
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable Modifications Contracts Number		1		2
Financing Receivable Modifications Investment Recorded				$ 677