Fair Value Measurement (Schedule of a Description of the Valuation Technique, Unobservable Input, and Qualitative Information for the Company's Assets and Liabilities Classfied as Level 3) (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Constant prepayment rate	19.25%	20.39%
Mortgage Servicing Rights [Member]
Valuation Technique	Discounted cash flow
Junior Subordinated Debentures [Member]
Valuation Technique	Discounted cash flow
Minimum [Member] | Junior Subordinated Debentures [Member]
Credit spread	5.40%
Maximum [Member] | Junior Subordinated Debentures [Member]
Credit spread	6.70%
Weighted Average [Member] | Mortgage Servicing Rights [Member]
Constant prepayment rate	19.25%
Discount rate	8.58%
Weighted Average [Member] | Junior Subordinated Debentures [Member]
Credit spread	5.70%