Loans And Leases (Impaired Loans And Leases By Class) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 422,652	$ 467,005
Total Recorded Investment	383,033	414,292
Recorded Investment No Allowance	140,444	153,202
Recorded Investment With Allowance	242,589	261,090
Related Valuation Allowance	23,311	27,449
Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	159,858	160,936
Total Recorded Investment	143,534	146,944
Recorded Investment No Allowance	23,545	24,423
Recorded Investment With Allowance	119,989	122,521
Related Valuation Allowance	13,003	14,731
1-4 family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	159,412	160,490
Total Recorded Investment	143,530	146,683
Recorded Investment No Allowance	23,544	24,267
Recorded Investment With Allowance	119,986	122,416
Related Valuation Allowance	13,003	14,726
Construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	446	446
Total Recorded Investment	4	261
Recorded Investment No Allowance	1	156
Recorded Investment With Allowance	3	105
Related Valuation Allowance	0	5
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	64,490	68,603
Total Recorded Investment	52,907	54,793
Recorded Investment No Allowance	27,722	27,630
Recorded Investment With Allowance	25,185	27,163
Related Valuation Allowance	3,281	3,611
Home equity loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	55,398	56,815
Total Recorded Investment	46,169	47,755
Recorded Investment No Allowance	23,903	23,967
Recorded Investment With Allowance	22,266	23,788
Related Valuation Allowance	2,752	2,960
Liquidating portfolio-home equity loans [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	9,092	11,788
Total Recorded Investment	6,738	7,038
Recorded Investment No Allowance	3,819	3,663
Recorded Investment With Allowance	2,919	3,375
Related Valuation Allowance	529	651
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	67,907	90,627
Total Recorded Investment	62,190	69,426
Recorded Investment No Allowance	21,960	21,942
Recorded Investment With Allowance	40,230	47,484
Related Valuation Allowance	1,630	6,423
Commercial non-mortgage [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	67,907	90,627
Total Recorded Investment	62,190	69,426
Recorded Investment No Allowance	21,960	21,942
Recorded Investment With Allowance	40,230	47,484
Related Valuation Allowance	1,630	6,423
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	130,066	144,482
Total Recorded Investment	124,110	141,149
Recorded Investment No Allowance	66,925	77,426
Recorded Investment With Allowance	57,185	63,723
Related Valuation Allowance	5,397	2,683
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	116,349	123,861
Total Recorded Investment	111,421	121,193
Recorded Investment No Allowance	54,512	65,212
Recorded Investment With Allowance	56,909	55,981
Related Valuation Allowance	5,361	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	13,717	13,444
Total Recorded Investment	12,689	12,771
Recorded Investment No Allowance	12,413	5,029
Recorded Investment With Allowance	276	7,742
Related Valuation Allowance	36	111
Equipment financing [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	331	2,357
Total Recorded Investment	292	1,980
Recorded Investment No Allowance	292	1,781
Recorded Investment With Allowance	0	199
Related Valuation Allowance	$ 0	$ 1