Loans And Leases (Commercial, Commercial Real Estate Loans And Equipment Financing Loans Segregated By Risk Rating Exposure) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	$ 241,612	$ 272,372
Commercial [Member]
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	2,746,434	2,392,376
Commercial Real Estate [Member]
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	2,635,390	2,392,075
Equipment Financing [Member]
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	401,748	474,804
Pass [Member]
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	56,782	46,524
Pass [Member] | Commercial [Member]
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	2,527,259	2,148,970
Pass [Member] | Commercial Real Estate [Member]
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	2,383,685	2,036,738
Pass [Member] | Equipment Financing [Member]
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	358,157	407,943
Special Mention [Member]
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	10,191	4,622
Special Mention [Member] | Commercial [Member]
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	54,871	32,578
Special Mention [Member] | Commercial Real Estate [Member]
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	51,037	58,238
Special Mention [Member] | Equipment Financing [Member]
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	12,475	15,416
Substandard [Member]
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	174,279	220,899
Substandard [Member] | Commercial [Member]
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	163,356	208,555
Substandard [Member] | Commercial Real Estate [Member]
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	200,148	296,478
Substandard [Member] | Equipment Financing [Member]
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	31,116	51,445
Doubtful [Member]
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	360	327
Doubtful [Member] | Commercial [Member]
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	948	2,273
Doubtful [Member] | Commercial Real Estate [Member]
Risk Rating Exposure [ Line Items]
(1) - (6) Pass	$ 520	$ 621