Variable Interest Entities (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Classification of carrying amount of assets and liabilities of VIE [Abstract]
Proceeds from issuance of subordinated debt	$ 82,500,000
Maximum Loss Exposure
Liability Recognized
Low Income Housing Partnerships [Member] | Other Assets [Member]
Classification of carrying amount of assets and liabilities of VIE [Abstract]
Maximum Loss Exposure	10,769,000	7,945,000
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
Liability Recognized	82,476,000	82,476,000
Commercial Troubled Debt Restructurings [Member] | Loans [Member]
Classification of carrying amount of assets and liabilities of VIE [Abstract]
Maximum Loss Exposure	3,773,000	15,273,000
Liability Recognized	$ 0	$ 0