Loans And Leases (Summary Of Loan And Lease Portfolio Aging By Class Of Loan) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	$ 49,034	$ 42,751
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	19,153	19,088
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	207	730
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	162,596	188,242
Financing Receivable, Recorded Investment, Past Due, Total	230,990	250,811
Financing Receivable, Recorded Investment, Current	11,533,028	11,008,133
Total Loans, Total	11,764,018	11,258,944
1-4 Family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	14,767	15,939
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	6,260	7,245
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	74,585	75,977
Financing Receivable, Recorded Investment, Past Due, Total	95,612	99,161
Financing Receivable, Recorded Investment, Current	3,149,564	3,080,870
Total Loans, Total	3,245,176	3,180,031
Permanent-NCLC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	762	802
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	351	408
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	4,070	4,636
Financing Receivable, Recorded Investment, Past Due, Total	5,183	5,846
Financing Receivable, Recorded Investment, Current	14,566	15,656
Total Loans, Total	19,749	21,502
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	361	292
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	825	1,234
Financing Receivable, Recorded Investment, Past Due, Total	1,186	1,526
Financing Receivable, Recorded Investment, Current	37,804	27,815
Total Loans, Total	38,990	29,341
Liquidating Portfolio-Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	0	0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Financing Receivable, Recorded Investment, Past Due, Total	0	0
Financing Receivable, Recorded Investment, Current	4	8
Total Loans, Total	4	8
Home Equity Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	16,530	14,859
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	8,000	5,891
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	23,561	25,115
Financing Receivable, Recorded Investment, Past Due, Total	48,091	45,865
Financing Receivable, Recorded Investment, Current	2,453,716	2,534,998
Total Loans, Total	2,501,807	2,580,863
Liquidating Portfolio-Home Equity Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	3,805	3,231
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,244	1,459
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	4,682	5,174
Financing Receivable, Recorded Investment, Past Due, Total	9,731	9,864
Financing Receivable, Recorded Investment, Current	123,256	140,247
Total Loans, Total	132,987	150,111
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	418	346
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	155	119
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	149	117
Financing Receivable, Recorded Investment, Past Due, Total	722	582
Financing Receivable, Recorded Investment, Current	41,011	37,251
Total Loans, Total	41,733	37,833
Commercial Non-Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	3,395	3,267
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,087	1,399
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	207	162
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	30,352	27,969
Financing Receivable, Recorded Investment, Past Due, Total	35,041	32,797
Financing Receivable, Recorded Investment, Current	2,174,794	1,905,085
Total Loans, Total	2,209,835	1,937,882
Asset-Based Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	0	0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	92	1,904
Financing Receivable, Recorded Investment, Past Due, Total	92	1,904
Financing Receivable, Recorded Investment, Current	536,507	452,590
Total Loans, Total	536,599	454,494
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	5,514	1,330
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	1,696	452
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	433
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	15,747	32,202
Financing Receivable, Recorded Investment, Past Due, Total	22,957	34,417
Financing Receivable, Recorded Investment, Current	2,477,160	2,244,357
Total Loans, Total	2,500,117	2,278,774
Commercial Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	0	0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	49	0
Financing Receivable, Recorded Investment, Past Due, Total	49	0
Financing Receivable, Recorded Investment, Current	105,076	73,525
Total Loans, Total	105,125	73,525
Residential Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	318	0
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	0	0
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	135
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	5,432	6,760
Financing Receivable, Recorded Investment, Past Due, Total	5,750	6,895
Financing Receivable, Recorded Investment, Current	24,398	32,881
Total Loans, Total	30,148	39,776
Equipment Financing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 30 to 59 Days Past Due	3,164	2,685
Financing Receivable, Recorded Investment, 60 to 89 Days Past Due	360	2,115
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due	0	0
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	3,052	7,154
Financing Receivable, Recorded Investment, Past Due, Total	6,576	11,954
Financing Receivable, Recorded Investment, Current	395,172	462,850
Total Loans, Total	$ 401,748	$ 474,804