Variable Interest Entities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Classification of carrying amount of assets and liabilities of VIE [Abstract]
Maximum Loss Exposure	$ 0	$ 0
Liability Recognized	0	0
Low Income Housing Partnerships [Member] | Other Assets [Member]
Classification of carrying amount of assets and liabilities of VIE [Abstract]
Maximum Loss Exposure	5,996	6,096
Liability Recognized	0	0
Trust Preferred Issuances [Member] | Subordinated Debt [Member]
Classification of carrying amount of assets and liabilities of VIE [Abstract]
Maximum Loss Exposure	0	0
Liability Recognized	82,476	82,476
Commercial Troubled Debt Restructurings [Member] | Loans [Member]
Classification of carrying amount of assets and liabilities of VIE [Abstract]
Maximum Loss Exposure	15,310	20,951
Liability Recognized	$ 0	$ 0