Fair Value Measurement (Quantitative Information About Significant Unobservable Inputs For MSRs) (Details) - Mortgage Servicing Rights [Member] - Level 3 [Member]	Sep. 30, 2020	Dec. 31, 2019
Servicing Fees [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value measurement of unobservable input (as a percent)	0.25	0.25
Discount Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value measurement of unobservable input (as a percent)	9.04	9.00
Prepayment Rate (CPR) [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value measurement of unobservable input (as a percent)	9.59	8.21