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)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Constant prepayment rate	13.20%	11.43%
Discount rate	9.70%	9.69%
Mortgage Servicing Rights
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation technique	Discounted cash flow
Mortgage Servicing Rights | Weighted Average
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Constant prepayment rate	13.20%
Discount rate	9.70%
Interest Rate Lock Commitments
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation technique	Internal Pricing Model
Interest Rate Lock Commitments | Weighted Average
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Pull-through rate	86.48%
Junior Subordinated Debentures
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation technique	Discounted cash flow
Junior Subordinated Debentures | Weighted Average
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Credit Spread	5.26%