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Loans and Leases - Impaired Loans (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Recorded Investment $ 139.8 $ 156.1
Unpaid principal balance 186.6 199.8
Specific allowance 5.4 2.1
Average recorded investment 149.2 159.7
Interest income recognized 1.6 2.3
Commercial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 33.9 22.6
Unpaid principal balance 46.1 27.3
Specific allowance 1.1 0.0
Average recorded investment 27.0 35.0
Interest income recognized 0.1 0.4
Commercial | Commercial and Institutional    
Financing Receivable, Impaired [Line Items]    
With no related specific reserve, recorded investment 24.9 7.9
With a related specific reserve, recorded investment 0.5 0.0
With no related specific reserve, unpaid principal balance 30.3 8.7
With a related specific reserve, unpaid principal balance 5.4 0.0
Specific allowance 0.5 0.0
With no related specific reserve, average recorded investment 8.7 8.6
With a related specific reserve, average recorded investment 6.5 7.6
With no related specific reserve, interest income recognized 0.0 0.0
With a related specific allowance, interest income recognized 0.0 0.0
Commercial | Real Estate    
Financing Receivable, Impaired [Line Items]    
With no related specific reserve, recorded investment 5.7 14.7
With a related specific reserve, recorded investment 2.8 0.0
With no related specific reserve, unpaid principal balance 7.6 18.6
With a related specific reserve, unpaid principal balance 2.8 0.0
Specific allowance 0.6 0.0
With no related specific reserve, average recorded investment 9.2 17.0
With a related specific reserve, average recorded investment 2.6 0.0
With no related specific reserve, interest income recognized 0.1 0.3
With a related specific allowance, interest income recognized 0.0 0.0
Commercial | Lease Financing, net    
Financing Receivable, Impaired [Line Items]    
With no related specific reserve, average recorded investment 0.0 0.6
With a related specific reserve, average recorded investment 0.0 1.2
With no related specific reserve, interest income recognized 0.0 0.1
With a related specific allowance, interest income recognized 0.0 0.0
Personal    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 105.9 133.5
Unpaid principal balance 140.5 172.5
Specific allowance 4.3 2.1
Average recorded investment 122.2 124.7
Interest income recognized 1.5 1.9
Personal | Real Estate    
Financing Receivable, Impaired [Line Items]    
With no related specific reserve, recorded investment 90.9 125.5
With a related specific reserve, recorded investment 14.3 7.7
With no related specific reserve, unpaid principal balance 124.9 164.3
With a related specific reserve, unpaid principal balance 14.9 7.9
Specific allowance 4.3 2.1
With no related specific reserve, average recorded investment 105.0 121.4
With a related specific reserve, average recorded investment 17.0 2.1
With no related specific reserve, interest income recognized 1.5 1.9
With a related specific allowance, interest income recognized 0.0 0.0
Personal | Private Client    
Financing Receivable, Impaired [Line Items]    
With no related specific reserve, recorded investment 0.7 0.3
With no related specific reserve, unpaid principal balance 0.7 0.3
With no related specific reserve, average recorded investment 0.2 1.2
With no related specific reserve, interest income recognized $ 0.0 $ 0.0