Loans And Leases (Impaired Loans And Leases By Class) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 437,256	$ 467,005
Total Recorded Investment	399,645	414,292
Recorded Investment No Allowance	162,463	153,202
Recorded Investment With Allowance	237,183	261,090
Related Valuation Allowance	21,918	27,449
Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	162,467	160,936
Total Recorded Investment	146,486	146,944
Recorded Investment No Allowance	23,483	24,423
Recorded Investment With Allowance	123,003	122,521
Related Valuation Allowance	14,010	14,731
1-4 family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	162,021	160,490
Total Recorded Investment	146,226	146,683
Recorded Investment No Allowance	23,327	24,267
Recorded Investment With Allowance	122,900	122,416
Related Valuation Allowance	14,005	14,726
Construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	446	446
Total Recorded Investment	260	261
Recorded Investment No Allowance	156	156
Recorded Investment With Allowance	103	105
Related Valuation Allowance	5	5
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	64,030	68,603
Total Recorded Investment	53,706	54,793
Recorded Investment No Allowance	27,842	27,630
Recorded Investment With Allowance	25,865	27,163
Related Valuation Allowance	3,506	3,611
Home equity loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	55,281	56,815
Total Recorded Investment	46,931	47,755
Recorded Investment No Allowance	24,003	23,967
Recorded Investment With Allowance	22,929	23,788
Related Valuation Allowance	2,947	2,960
Liquidating portfolio-home equity loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	8,749	11,788
Total Recorded Investment	6,775	7,038
Recorded Investment No Allowance	3,839	3,663
Recorded Investment With Allowance	2,936	3,375
Related Valuation Allowance	559	651
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	69,357	90,627
Total Recorded Investment	64,078	69,426
Recorded Investment No Allowance	35,871	21,942
Recorded Investment With Allowance	28,206	47,484
Related Valuation Allowance	880	6,423
Commercial non-mortgage [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	69,357	90,627
Total Recorded Investment	64,078	69,426
Recorded Investment No Allowance	35,871	21,942
Recorded Investment With Allowance	28,206	47,484
Related Valuation Allowance	880	6,423
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	140,979	144,482
Total Recorded Investment	134,990	141,149
Recorded Investment No Allowance	74,977	77,426
Recorded Investment With Allowance	60,014	63,723
Related Valuation Allowance	3,522	2,683
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	127,285	123,861
Total Recorded Investment	122,226	121,193
Recorded Investment No Allowance	70,144	65,212
Recorded Investment With Allowance	52,082	55,981
Related Valuation Allowance	3,404	2,572
Commercial construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	0	7,177
Total Recorded Investment	0	7,185
Recorded Investment No Allowance	0	7,185
Recorded Investment With Allowance	0	0
Related Valuation Allowance	0	0
Residential development [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	13,694	13,444
Total Recorded Investment	12,764	12,771
Recorded Investment No Allowance	4,833	5,029
Recorded Investment With Allowance	7,932	7,742
Related Valuation Allowance	118	111
Equipment financing [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	423	2,357
Total Recorded Investment	385	1,980
Recorded Investment No Allowance	290	1,781
Recorded Investment With Allowance	95	199
Related Valuation Allowance	$ 0	$ 1