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Loans - Summary of Individually-Evaluated Impaired Loans by Class of Loan (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
With no related allowance for loan losses, Unpaid Principal Balance $ 178.4 $ 187.4
With no related allowance for loan losses, Recorded Investment 157.4 167.7
With a related allowance for loan losses, Unpaid Principal Balance 66.9 63.1
With a related allowance for loan losses, Recorded Investment 61.9 55.2
Related Allowance for Loan Losses 11.2 9.1
Unpaid Principal Balance 245.3 250.5
Recorded Investment 219.3 222.9
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
With a related allowance for loan losses, Recorded Investment 49.0  
Related Allowance for Loan Losses 9.0 6.7
Unpaid Principal Balance 137.9 149.4
Recorded Investment 122.6 132.9
Commercial [Member] | Commercial Real Estate Loan [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance for loan losses, Unpaid Principal Balance 28.9 31.0
With no related allowance for loan losses, Recorded Investment 25.9 28.1
With a related allowance for loan losses, Unpaid Principal Balance 21.5 23.8
With a related allowance for loan losses, Recorded Investment 21.0 21.8
Related Allowance for Loan Losses 3.4 1.6
Unpaid Principal Balance 50.4 54.8
Recorded Investment 46.9 49.9
Commercial [Member] | Commercial and Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance for loan losses, Unpaid Principal Balance 31.0 45.6
With no related allowance for loan losses, Recorded Investment 25.9 42.0
With a related allowance for loan losses, Unpaid Principal Balance 20.0 12.6
With a related allowance for loan losses, Recorded Investment 16.4 10.2
Related Allowance for Loan Losses 3.9 2.4
Unpaid Principal Balance 51.0 58.2
Recorded Investment 42.3 52.2
Commercial [Member] | Equipment Financing [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance for loan losses, Unpaid Principal Balance 24.1 20.2
With no related allowance for loan losses, Recorded Investment 21.8 18.0
With a related allowance for loan losses, Unpaid Principal Balance 12.4 16.2
With a related allowance for loan losses, Recorded Investment 11.6 12.8
Related Allowance for Loan Losses 1.7 2.7
Unpaid Principal Balance 36.5 36.4
Recorded Investment 33.4 30.8
Retail Loans [Member]    
Financing Receivable, Impaired [Line Items]    
With a related allowance for loan losses, Recorded Investment 12.9  
Related Allowance for Loan Losses 2.2 2.4
Unpaid Principal Balance 107.4 101.1
Recorded Investment 96.7 90.0
Retail Loans [Member] | Residential Mortgage Loan [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance for loan losses, Unpaid Principal Balance 68.4 66.8
With no related allowance for loan losses, Recorded Investment 60.8 59.3
With a related allowance for loan losses, Unpaid Principal Balance 11.6 8.8
With a related allowance for loan losses, Recorded Investment 11.5 8.8
Related Allowance for Loan Losses 1.5 1.7
Unpaid Principal Balance 80.0 75.6
Recorded Investment 72.3 68.1
Retail Loans [Member] | Home Equity Loan [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance for loan losses, Unpaid Principal Balance 26.0 23.8
With no related allowance for loan losses, Recorded Investment 23.0 20.3
With a related allowance for loan losses, Unpaid Principal Balance 1.4 1.7
With a related allowance for loan losses, Recorded Investment 1.4 1.6
Related Allowance for Loan Losses 0.7 0.7
Unpaid Principal Balance 27.4 25.5
Recorded Investment 24.4 21.9
Retail Loans [Member] | Other Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
With no related allowance for loan losses, Unpaid Principal Balance 0.0 0.0
With no related allowance for loan losses, Recorded Investment 0.0 0.0
With a related allowance for loan losses, Unpaid Principal Balance 0.0 0.0
With a related allowance for loan losses, Recorded Investment 0.0 0.0
Related Allowance for Loan Losses 0.0 0.0
Unpaid Principal Balance 0.0 0.0
Recorded Investment $ 0.0 $ 0.0