Loans And Leases (Information On How Loans And Leases Were Modified As A TDR) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012 Contract	Sep. 30, 2011 Contract	Sep. 30, 2012 Contract	Sep. 30, 2011 Contract
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Financing Receivable Modifications Contracts Number	701	65	818	301
2011 Combination of Rate and Maturity	$ 72,960	$ 31,031	$ 103,939	$ 123,141
Financing Receivable Modifications Pre Modification Investment Recorded	72,960	31,031	103,939	123,141
Financing Receivable Modifications Post Modification Investment Recorded	72,960	31,031	103,939	123,141
Percentage Of Financing Receivable Modifications Post Modification Coupon Rate	4.10%	5.90%	4.60%	4.90%
1-4 Family [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Financing Receivable Modifications Contracts Number	119	25	169	110
2011 Combination of Rate and Maturity	17,084	4,455	25,912	25,219
Financing Receivable Modifications Pre Modification Investment Recorded	17,084	4,455	25,912	25,219
Financing Receivable Modifications Post Modification Investment Recorded	17,084	4,455	25,912	25,219
Percentage Of Financing Receivable Modifications Post Modification Coupon Rate	4.70%	4.40%	4.40%	4.10%
Permanent-NCLC [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Financing Receivable Modifications Contracts Number	1	3	1	6
2011 Combination of Rate and Maturity	357	1,053	357	2,211
Financing Receivable Modifications Pre Modification Investment Recorded	357	1,053	357	2,211
Financing Receivable Modifications Post Modification Investment Recorded	357	1,053	357	2,211
Percentage Of Financing Receivable Modifications Post Modification Coupon Rate	4.50%	3.80%	4.50%	4.00%
Construction Loans [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Financing Receivable Modifications Contracts Number	1		2
2011 Combination of Rate and Maturity	159		263
Financing Receivable Modifications Pre Modification Investment Recorded	159		263
Financing Receivable Modifications Post Modification Investment Recorded	159		263
Percentage Of Financing Receivable Modifications Post Modification Coupon Rate	6.40%		6.60%
Home Equity Loans [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Financing Receivable Modifications Contracts Number	459	20	486	96
2011 Combination of Rate and Maturity	23,277	1,004	25,549	8,130
Financing Receivable Modifications Pre Modification Investment Recorded	23,277	1,004	25,549	8,130
Financing Receivable Modifications Post Modification Investment Recorded	23,277	1,004	25,549	8,130
Percentage Of Financing Receivable Modifications Post Modification Coupon Rate	5.10%	4.60%	5.00%	4.40%
Liquidating Portfolio-Home Equity Loans [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Financing Receivable Modifications Contracts Number	108	7	112	23
2011 Combination of Rate and Maturity	5,542	178	5,577	1,367
Financing Receivable Modifications Pre Modification Investment Recorded	5,542	178	5,577	1,367
Financing Receivable Modifications Post Modification Investment Recorded	5,542	178	5,577	1,367
Percentage Of Financing Receivable Modifications Post Modification Coupon Rate	5.50%	5.90%	5.60%	5.50%
Commercial Non-Mortgage [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Financing Receivable Modifications Contracts Number	8	8	33	43
2011 Combination of Rate and Maturity	4,786	23,911	21,772	41,337
Financing Receivable Modifications Pre Modification Investment Recorded	4,786	23,911	21,772	41,337
Financing Receivable Modifications Post Modification Investment Recorded	4,786	23,911	21,772	41,337
Percentage Of Financing Receivable Modifications Post Modification Coupon Rate	3.10%	6.30%	6.30%	6.20%
Asset-Based Loans [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Financing Receivable Modifications Contracts Number		0		3
2011 Combination of Rate and Maturity				2,563
Financing Receivable Modifications Pre Modification Investment Recorded		0		2,563
Financing Receivable Modifications Post Modification Investment Recorded		0		2,563
Percentage Of Financing Receivable Modifications Post Modification Coupon Rate		0.00%		5.20%
Commercial Real Estate [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Financing Receivable Modifications Contracts Number	4	1	7	17
2011 Combination of Rate and Maturity	21,507	230	23,919	41,395
Financing Receivable Modifications Pre Modification Investment Recorded	21,507	230	23,919	41,395
Financing Receivable Modifications Post Modification Investment Recorded	21,507	230	23,919	41,395
Percentage Of Financing Receivable Modifications Post Modification Coupon Rate	2.20%	5.00%	2.50%	4.00%
Residential Development [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Financing Receivable Modifications Contracts Number		0		2
2011 Combination of Rate and Maturity		0		719
Financing Receivable Modifications Pre Modification Investment Recorded		0		719
Financing Receivable Modifications Post Modification Investment Recorded		0		719
Percentage Of Financing Receivable Modifications Post Modification Coupon Rate		0.00%		5.30%
Equipment Financing [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Financing Receivable Modifications Contracts Number	1	1	8	1
2011 Combination of Rate and Maturity	248	200	590	200
Financing Receivable Modifications Pre Modification Investment Recorded	248	200	590	200
Financing Receivable Modifications Post Modification Investment Recorded	248	200	590	200
Percentage Of Financing Receivable Modifications Post Modification Coupon Rate	6.10%	8.00%	6.70%	8.00%
Extended Maturity [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	642	2,132	5,186	34,946
Extended Maturity [Member] | 1-4 Family [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	604	1,757	1,634	7,682
Extended Maturity [Member] | Home Equity Loans [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	38	321	993	4,057
Extended Maturity [Member] | Liquidating Portfolio-Home Equity Loans [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	0	54	35	571
Extended Maturity [Member] | Commercial Non-Mortgage [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	0	0	314	5,607
Extended Maturity [Member] | Commercial Real Estate [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	0	0	2,068	17,029
Extended Maturity [Member] | Equipment Financing [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	0		142
Adjusted Interest Rates [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	117	200	1,230	12,119
Adjusted Interest Rates [Member] | 1-4 Family [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	0	0	1,006	2,706
Adjusted Interest Rates [Member] | Home Equity Loans [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	117		224
Adjusted Interest Rates [Member] | Commercial Non-Mortgage [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity		0		3,217
Adjusted Interest Rates [Member] | Commercial Real Estate [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity		0		5,996
Adjusted Interest Rates [Member] | Equipment Financing [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity		200		200
Combination Of Rate And Maturity [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	3,564	4,883	8,690	23,463
Combination Of Rate And Maturity [Member] | 1-4 Family [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	1,774	2,698	5,338	13,327
Combination Of Rate And Maturity [Member] | Permanent-NCLC [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	357	1,053	357	2,211
Combination Of Rate And Maturity [Member] | Construction Loans [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	0		104
Combination Of Rate And Maturity [Member] | Home Equity Loans [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	448	683	1,335	3,726
Combination Of Rate And Maturity [Member] | Liquidating Portfolio-Home Equity Loans [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity		124		796
Combination Of Rate And Maturity [Member] | Commercial Non-Mortgage [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	737	95	1,023	301
Combination Of Rate And Maturity [Member] | Asset-Based Loans [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity				2,563
Combination Of Rate And Maturity [Member] | Commercial Real Estate [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity		230	245	539
Combination Of Rate And Maturity [Member] | Equipment Financing [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	248		288
Other Credit Derivatives [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	68,637	23,816	88,833	52,613
Other Credit Derivatives [Member] | 1-4 Family [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	14,706	0	17,934	1,504
Other Credit Derivatives [Member] | Construction Loans [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	159		159
Other Credit Derivatives [Member] | Home Equity Loans [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	22,674	0	22,997	347
Other Credit Derivatives [Member] | Liquidating Portfolio-Home Equity Loans [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	5,542		5,542
Other Credit Derivatives [Member] | Commercial Non-Mortgage [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	4,049	23,816	20,435	32,212
Other Credit Derivatives [Member] | Commercial Real Estate [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity	21,507	0	21,606	17,831
Other Credit Derivatives [Member] | Residential Development [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity		0		719
Other Credit Derivatives [Member] | Equipment Financing [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
2011 Combination of Rate and Maturity			$ 160