Loans And Leases (Impaired Loans And Leases By Class) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	$ 509,791	$ 544,854
Impaired Financing Receivable, Recorded Investment	463,285	495,276
Impaired Financing Receivable, Related Allowance	30,923	46,605
1-4 Family [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	149,475	133,123
Impaired Financing Receivable, Recorded Investment	137,510	124,461
Impaired Financing Receivable, Related Allowance	13,504	16,611
Permanent-NCLC [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	11,574	12,005
Impaired Financing Receivable, Recorded Investment	10,809	10,718
Impaired Financing Receivable, Related Allowance	1,911	2,747
Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	446	129
Impaired Financing Receivable, Recorded Investment	263	132
Impaired Financing Receivable, Related Allowance	5	9
Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	58,643	35,285
Impaired Financing Receivable, Recorded Investment	52,295	31,153
Impaired Financing Receivable, Related Allowance	4,853	4,116
Liquidating Portfolio-Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	11,350	7,277
Impaired Financing Receivable, Recorded Investment	9,973	5,469
Impaired Financing Receivable, Related Allowance	2,942	1,050
Other Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	0	7
Impaired Financing Receivable, Recorded Investment	0	7
Impaired Financing Receivable, Related Allowance	0	1
Commercial Non-Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	95,982	118,293
Impaired Financing Receivable, Recorded Investment	80,820	105,359
Impaired Financing Receivable, Related Allowance	4,545	12,996
Asset-Based Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	2,047	7,814
Impaired Financing Receivable, Recorded Investment	113	1,859
Impaired Financing Receivable, Related Allowance	7	0
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	153,758	195,838
Impaired Financing Receivable, Recorded Investment	150,850	189,575
Impaired Financing Receivable, Related Allowance	3,082	8,514
Commercial Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	7,237	7,347
Impaired Financing Receivable, Recorded Investment	7,241	7,373
Impaired Financing Receivable, Related Allowance	0	557
Residential Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	12,943	16,495
Impaired Financing Receivable, Recorded Investment	12,265	15,902
Impaired Financing Receivable, Related Allowance	71	0
Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	6,336	11,241
Impaired Financing Receivable, Recorded Investment	1,146	3,268
Impaired Financing Receivable, Related Allowance	3	4
Total Residential [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	161,495	145,257
Impaired Financing Receivable, Recorded Investment	148,582	135,311
Impaired Financing Receivable, Related Allowance	15,420	19,367
Total Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	69,993	42,569
Impaired Financing Receivable, Recorded Investment	62,268	36,629
Impaired Financing Receivable, Related Allowance	7,795	5,167
Total Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	98,029	126,107
Impaired Financing Receivable, Recorded Investment	80,933	107,218
Impaired Financing Receivable, Related Allowance	4,552	12,996
Total Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	173,938	219,680
Impaired Financing Receivable, Recorded Investment	170,356	212,850
Impaired Financing Receivable, Related Allowance	3,153	9,071
Total Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance	6,336	11,241
Impaired Financing Receivable, Recorded Investment	1,146	3,268
Impaired Financing Receivable, Related Allowance	3	4
Recorded Investment No Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	161,805	156,344
Recorded Investment No Allowance [Member] | 1-4 Family [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	18,991	0
Recorded Investment No Allowance [Member] | Permanent-NCLC [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	1,871	0
Recorded Investment No Allowance [Member] | Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	159	0
Recorded Investment No Allowance [Member] | Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	20,552	4
Recorded Investment No Allowance [Member] | Liquidating Portfolio-Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	2,045	3
Recorded Investment No Allowance [Member] | Other Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	0
Recorded Investment No Allowance [Member] | Commercial Non-Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	25,875	30,207
Recorded Investment No Allowance [Member] | Asset-Based Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	1,859
Recorded Investment No Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	79,559	105,618
Recorded Investment No Allowance [Member] | Commercial Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	7,241	0
Recorded Investment No Allowance [Member] | Residential Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	4,524	15,902
Recorded Investment No Allowance [Member] | Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	988	2,751
Recorded Investment No Allowance [Member] | Total Residential [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	21,021	0
Recorded Investment No Allowance [Member] | Total Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	22,597	7
Recorded Investment No Allowance [Member] | Total Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	25,875	32,066
Recorded Investment No Allowance [Member] | Total Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	91,324	121,520
Recorded Investment No Allowance [Member] | Total Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	988	2,751
Recorded Investment With Allowance [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	301,480	338,932
Recorded Investment With Allowance [Member] | 1-4 Family [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	118,519	124,461
Recorded Investment With Allowance [Member] | Permanent-NCLC [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	8,938	10,718
Recorded Investment With Allowance [Member] | Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	104	132
Recorded Investment With Allowance [Member] | Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	31,743	31,149
Recorded Investment With Allowance [Member] | Liquidating Portfolio-Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	7,928	5,466
Recorded Investment With Allowance [Member] | Other Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	7
Recorded Investment With Allowance [Member] | Commercial Non-Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	54,945	75,152
Recorded Investment With Allowance [Member] | Asset-Based Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	113	0
Recorded Investment With Allowance [Member] | Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	71,291	83,957
Recorded Investment With Allowance [Member] | Commercial Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	7,373
Recorded Investment With Allowance [Member] | Residential Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	7,741	0
Recorded Investment With Allowance [Member] | Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	158	517
Recorded Investment With Allowance [Member] | Total Residential [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	127,561	135,311
Recorded Investment With Allowance [Member] | Total Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	39,671	36,622
Recorded Investment With Allowance [Member] | Total Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	55,058	75,152
Recorded Investment With Allowance [Member] | Total Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	79,032	91,330
Recorded Investment With Allowance [Member] | Total Equipment Financing [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 158	$ 517