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)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Constant prepayment rate	20.48%	21.39%
Discount rate	8.67%	8.65%
Mortgage Servicing Rights [Member]
Valuation Technique	Discounted cash flow
Interest Rate Lock Commitments [Member]
Valuation Technique	Internal Pricing Model
Junior Subordinated Debentures [Member]
Valuation Technique	Discounted cash flow
Weighted Average [Member] | Mortgage Servicing Rights [Member]
Constant prepayment rate	20.48%
Discount rate	8.67%
Weighted Average [Member] | Interest Rate Lock Commitments [Member]
Fair Value Inputs, Pull-through Rate	76.50%
Weighted Average [Member] | Junior Subordinated Debentures [Member]
Credit spread	6.21%