Variable Interest Entities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Low Income Housing Partnerships [Member] | Other Asset [Member]
Classification of carrying amount of assets and liabilities of VIE [Abstract]
Assets Recognized (maximum loss)	$ 5,854	$ 5,917
Liability Recognized	0	0
Trust Preferred Issuances [Member] | Subordinated Debt [Member]
Classification of carrying amount of assets and liabilities of VIE [Abstract]
Liability Recognized	82,476	82,476
Commercial Troubled Debt Restructurings [Member] | Loans [Member]
Classification of carrying amount of assets and liabilities of VIE [Abstract]
Assets Recognized (maximum loss)	20,022	17,223
Liability Recognized	$ 0	$ 0