Fair Value Measurement (Schedule Of A Description Of The Valuation Technique, Unobservable Input, And Qualitative Information For The Company's Assets And Liabilities Classified As Level 3) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Constant prepayment rate	12.27%	11.43%	11.70%
Discount rate	9.70%	9.69%	9.68%
Mortgage Servicing Rights
Valuation Technique	Discounted cash flow
Interest Rate Lock Commitments
Valuation Technique	Internal pricing model
Junior Subordinated Debentures
Valuation Technique	Discounted cash flow
Weighted Average | Mortgage Servicing Rights
Constant prepayment rate	12.27%
Discount rate	9.70%
Weighted Average | Interest Rate Lock Commitments
Pull-through rate	88.83%
Weighted Average | Junior Subordinated Debentures
Credit spread	4.97%