Acquisition and Discontinued Operations (Summary of Key Valuation Input Assumptions by Division) (Details) - MOB	Jan. 01, 2020
Commercial Banking | Commercial Finance | Discount Rate | Minimum
Business Acquisition [Line Items]
Valuation input assumptions	2.50
Commercial Banking | Commercial Finance | Discount Rate | Maximum
Business Acquisition [Line Items]
Valuation input assumptions	15.5
Commercial Banking | Commercial Finance | Discount Rate | Weighted Avg.
Business Acquisition [Line Items]
Valuation input assumptions	4.33
Commercial Banking | Commercial Finance | Severity Rate | Minimum
Business Acquisition [Line Items]
Valuation input assumptions	0.00
Commercial Banking | Commercial Finance | Severity Rate | Maximum
Business Acquisition [Line Items]
Valuation input assumptions	60.00
Commercial Banking | Commercial Finance | Severity Rate | Weighted Avg.
Business Acquisition [Line Items]
Valuation input assumptions	18.59
Commercial Banking | Commercial Finance | Prepayment Rate | Minimum
Business Acquisition [Line Items]
Valuation input assumptions	0.00
Commercial Banking | Commercial Finance | Prepayment Rate | Maximum
Business Acquisition [Line Items]
Valuation input assumptions	26.75
Commercial Banking | Commercial Finance | Prepayment Rate | Weighted Avg.
Business Acquisition [Line Items]
Valuation input assumptions	17.99
Commercial Banking | Commercial Finance | Default Rate | Minimum
Business Acquisition [Line Items]
Valuation input assumptions	0.00
Commercial Banking | Commercial Finance | Default Rate | Maximum
Business Acquisition [Line Items]
Valuation input assumptions	7.00
Commercial Banking | Commercial Finance | Default Rate | Weighted Avg.
Business Acquisition [Line Items]
Valuation input assumptions	1.90
Commercial Banking | Real Estate Finance | Discount Rate | Minimum
Business Acquisition [Line Items]
Valuation input assumptions	3.25
Commercial Banking | Real Estate Finance | Discount Rate | Maximum
Business Acquisition [Line Items]
Valuation input assumptions	5.50
Commercial Banking | Real Estate Finance | Discount Rate | Weighted Avg.
Business Acquisition [Line Items]
Valuation input assumptions	3.86
Commercial Banking | Real Estate Finance | Severity Rate | Minimum
Business Acquisition [Line Items]
Valuation input assumptions	0.15
Commercial Banking | Real Estate Finance | Severity Rate | Maximum
Business Acquisition [Line Items]
Valuation input assumptions	0.30
Commercial Banking | Real Estate Finance | Severity Rate | Weighted Avg.
Business Acquisition [Line Items]
Valuation input assumptions	18.37
Commercial Banking | Real Estate Finance | Prepayment Rate | Minimum
Business Acquisition [Line Items]
Valuation input assumptions	0.50
Commercial Banking | Real Estate Finance | Prepayment Rate | Maximum
Business Acquisition [Line Items]
Valuation input assumptions	26.75
Commercial Banking | Real Estate Finance | Prepayment Rate | Weighted Avg.
Business Acquisition [Line Items]
Valuation input assumptions	17.77
Commercial Banking | Real Estate Finance | Default Rate | Minimum
Business Acquisition [Line Items]
Valuation input assumptions	0.10
Commercial Banking | Real Estate Finance | Default Rate | Maximum
Business Acquisition [Line Items]
Valuation input assumptions	7.00
Commercial Banking | Real Estate Finance | Default Rate | Weighted Avg.
Business Acquisition [Line Items]
Valuation input assumptions	2.67
Consumer Banking | Consumer and Community Banking | Discount Rate | Minimum
Business Acquisition [Line Items]
Valuation input assumptions	2.50
Consumer Banking | Consumer and Community Banking | Discount Rate | Maximum
Business Acquisition [Line Items]
Valuation input assumptions	6.75
Consumer Banking | Consumer and Community Banking | Discount Rate | Weighted Avg.
Business Acquisition [Line Items]
Valuation input assumptions	3.42
Consumer Banking | Consumer and Community Banking | Severity Rate | Minimum
Business Acquisition [Line Items]
Valuation input assumptions	0.05
Consumer Banking | Consumer and Community Banking | Severity Rate | Maximum
Business Acquisition [Line Items]
Valuation input assumptions	0.35
Consumer Banking | Consumer and Community Banking | Severity Rate | Weighted Avg.
Business Acquisition [Line Items]
Valuation input assumptions	9.95
Consumer Banking | Consumer and Community Banking | Prepayment Rate | Minimum
Business Acquisition [Line Items]
Valuation input assumptions	1.50
Consumer Banking | Consumer and Community Banking | Prepayment Rate | Maximum
Business Acquisition [Line Items]
Valuation input assumptions	30.0
Consumer Banking | Consumer and Community Banking | Prepayment Rate | Weighted Avg.
Business Acquisition [Line Items]
Valuation input assumptions	21.93
Consumer Banking | Consumer and Community Banking | Default Rate | Minimum
Business Acquisition [Line Items]
Valuation input assumptions	0.05
Consumer Banking | Consumer and Community Banking | Default Rate | Maximum
Business Acquisition [Line Items]
Valuation input assumptions	7.00
Consumer Banking | Consumer and Community Banking | Default Rate | Weighted Avg.
Business Acquisition [Line Items]
Valuation input assumptions	0.33