Loans and Leases and the Allowance for Credit Losses (Details) (USD $) In Thousands	Jun. 30, 2011
Outstanding principal and carrying value of acquired loans recorded at fair value
Outstanding principal balance	$ 10,445,425
Carrying amount	$ 9,268,721

Name:

us-gaap_AccountsNotesLoansAndFinancingReceivableGrossAllowanceAndNetAbstract

Namespace Prefix:

us-gaap

Data Type:

xbrli:stringItemType

Balance Type:

na

Period Type:

duration