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Loans and Leases (Information on Loans and Leases Modified as TDR within the Previous 12 Months (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
numberOfHoldings
Dec. 31, 2018
numberOfHoldings
Dec. 31, 2017
numberOfHoldings
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts   0 0
Commercial Portfolio Segment [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 6    
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ $ 0.8    
Commercial Real Estate Portfolio Segment [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 1    
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ $ 1.7