Loans And Leases (Interest Income From Impaired Loans And Leases, By Class) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Financing Receivable, Impaired [Line Items]
Average Recorded Investment			$ 342,224	$ 398,664
Accrued Interest Income	3,152	3,335	9,187	10,209
Cash Basis Interest Income	612	933	1,842	2,777
Residential [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment			143,613	145,240
Accrued Interest Income	1,144	1,015	3,482	3,098
Cash Basis Interest Income	305	520	912	1,476
1-4 family [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment			143,613	145,240
Accrued Interest Income	1,144	1,015	3,482	3,098
Cash Basis Interest Income	305	520	912	1,476
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment			51,841	53,850
Accrued Interest Income	372	250	1,100	748
Cash Basis Interest Income	307	413	930	1,301
Home equity [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment			51,841	53,850
Accrued Interest Income	372	250	1,100	748
Cash Basis Interest Income	307	413	930	1,301
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment			46,764	65,808
Accrued Interest Income	617	794	1,787	2,187
Cash Basis Interest Income	0	0	0	0
Commercial non-mortgage [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment			46,764	65,808
Accrued Interest Income	617	794	1,787	2,187
Cash Basis Interest Income	0	0	0	0
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment			99,021	132,630
Accrued Interest Income	1,008	1,270	2,801	4,157
Cash Basis Interest Income	0	0	0	0
Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment			89,593	116,307
Accrued Interest Income	933	1,109	2,585	3,675
Cash Basis Interest Income	0	0	0	0
Commercial construction [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment			9,428	16,323
Accrued Interest Income	75	161	216	482
Cash Basis Interest Income	0	0	0	0
Equipment financing [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment			985	1,136
Accrued Interest Income	11	6	17	19
Cash Basis Interest Income	0	0	0	0
Finance Leases Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Average Recorded Investment			985	1,136
Accrued Interest Income	11	6	17	19
Cash Basis Interest Income	$ 0	$ 0	$ 0	$ 0