Loans And Leases (Loans And Leases Modified As A TDR) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Contract	Dec. 31, 2011 Contract
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	909	346
Pre- Modification Recorded Investment	$ 115,539	$ 149,438
Post- Modification Recorded Investment	115,539	149,438
Post- Modification Coupon Rate	4.60%	4.80%
1-4 Family [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	195	131
Pre- Modification Recorded Investment	32,010	29,728
Post- Modification Recorded Investment	32,010	29,728
Post- Modification Coupon Rate	4.40%	4.10%
Permanent-NCLC [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	2	6
Pre- Modification Recorded Investment	964	2,211
Post- Modification Recorded Investment	964	2,211
Post- Modification Coupon Rate	3.60%	4.00%
Construction Loans [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	2	0
Pre- Modification Recorded Investment	263	0
Post- Modification Recorded Investment	263	0
Post- Modification Coupon Rate	6.60%	0.00%
Home Equity Loans [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	526	106
Pre- Modification Recorded Investment	26,569	9,422
Post- Modification Recorded Investment	26,569	9,422
Post- Modification Coupon Rate	5.00%	4.30%
Liquidating Portfolio-Home Equity Loans [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	123	26
Pre- Modification Recorded Investment	5,693	1,428
Post- Modification Recorded Investment	5,693	1,428
Post- Modification Coupon Rate	5.60%	5.40%
Commercial Non-Mortgage [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	37	48
Pre- Modification Recorded Investment	22,699	45,507
Post- Modification Recorded Investment	22,699	45,507
Post- Modification Coupon Rate	6.30%	6.40%
Asset-Based Loans [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	0	3
Pre- Modification Recorded Investment	0	2,563
Post- Modification Recorded Investment	0	2,563
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]
Number of Loans and Leases	10	21
Pre- Modification Recorded Investment	25,855	47,544
Post- Modification Recorded Investment	25,855	47,544
Post- Modification Coupon Rate	2.80%	4.10%
Commercial Construction [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	0	1
Pre- Modification Recorded Investment	0	10,100
Post- Modification Recorded Investment	0	10,100
Post- Modification Coupon Rate	0.00%	3.00%
Residential Development [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	6	2
Pre- Modification Recorded Investment	896	719
Post- Modification Recorded Investment	896	719
Post- Modification Coupon Rate	5.30%	5.30%
Equipment Financing [Member]
Information On How Loans And Leases Were Modified As Troubled Debt Restructuring [Line Items]
Number of Loans and Leases	8	2
Pre- Modification Recorded Investment	590	216
Post- Modification Recorded Investment	$ 590	$ 216
Post- Modification Coupon Rate	6.70%	7.90%