Loans and Leases (Net Investment in Direct Financing Leases) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Net Investment In Direct Financing Leases [Line Items]
Total leases	$ 998,787	$ 900,371
Minimum Lease Payments Receivable [Member]
Net Investment In Direct Financing Leases [Line Items]
Net Investment in Direct Financing Leases	598,443	568,110
Estimated Residual Value Of Leases [Member]
Net Investment In Direct Financing Leases [Line Items]
Net Investment in Direct Financing Leases	481,312	409,753
Unearned Income Under Lease Contracts [Member]
Net Investment In Direct Financing Leases [Line Items]
Net Investment in Direct Financing Leases	$ (80,968)	$ (77,492)

The net amount due as of the balance sheet date consisting of: (a) minimum lease payments due on direct financing and sales-type leases, (b) unguaranteed residual value, and (c) any unamortized initial direct costs on direct financing leases; less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6952072&loc=d3e45377-112738

Name:	us-gaap_NetInvestmentInDirectFinancingAndSalesTypeLeases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant