Loans And Leases (Impaired Loans And Leases By Class) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 372,488	$ 388,513
Total Recorded Investment	335,385	349,060
Recorded Investment No Allowance	120,285	128,058
Recorded Investment With Allowance	215,100	221,002
Related Valuation Allowance	21,230	20,451
Residential [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	159,486	158,361
Total Recorded Investment	144,355	142,871
Recorded Investment No Allowance	24,272	23,988
Recorded Investment With Allowance	120,083	118,883
Related Valuation Allowance	11,501	10,534
1-4 family [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	159,486	158,361
Total Recorded Investment	144,355	142,871
Recorded Investment No Allowance	24,272	23,988
Recorded Investment With Allowance	120,083	118,883
Related Valuation Allowance	11,501	10,534
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	60,717	63,886
Total Recorded Investment	51,503	52,179
Recorded Investment No Allowance	26,885	27,323
Recorded Investment With Allowance	24,618	24,856
Related Valuation Allowance	4,165	4,595
Home equity [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	60,717	63,886
Total Recorded Investment	51,503	52,179
Recorded Investment No Allowance	26,885	27,323
Recorded Investment With Allowance	24,618	24,856
Related Valuation Allowance	4,165	4,595
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	50,359	59,279
Total Recorded Investment	41,329	52,199
Recorded Investment No Allowance	17,754	23,138
Recorded Investment With Allowance	23,575	29,061
Related Valuation Allowance	1,717	1,878
Commercial non-mortgage [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	50,359	59,279
Total Recorded Investment	41,329	52,199
Recorded Investment No Allowance	17,754	23,138
Recorded Investment With Allowance	23,575	29,061
Related Valuation Allowance	1,717	1,878
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	99,668	106,738
Total Recorded Investment	96,439	101,601
Recorded Investment No Allowance	50,260	53,399
Recorded Investment With Allowance	46,179	48,202
Related Valuation Allowance	3,818	3,444
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	90,230	95,013
Total Recorded Investment	88,209	90,976
Recorded Investment No Allowance	42,743	42,774
Recorded Investment With Allowance	45,466	48,202
Related Valuation Allowance	3,786	3,444
Commercial construction [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	9,438	11,725
Total Recorded Investment	8,230	10,625
Recorded Investment No Allowance	7,517	10,625
Recorded Investment With Allowance	713	0
Related Valuation Allowance	32	0
Equipment financing [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,258	249
Total Recorded Investment	1,759	210
Recorded Investment No Allowance	1,114	210
Recorded Investment With Allowance	645	0
Related Valuation Allowance	29	0
Finance Leases Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,258	249
Total Recorded Investment	1,759	210
Recorded Investment No Allowance	1,114	210
Recorded Investment With Allowance	645	0
Related Valuation Allowance	$ 29	$ 0