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Loans and Leases - Impaired Loans (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Recorded Investment $ 92.2 $ 116.2
Unpaid principal balance 123.7 150.6
Specific allowance 5.0 7.2
Average recorded investment 120.2 124.6
Interest income recognized 2.2 2.2
Commercial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 10.4 15.0
Unpaid principal balance 14.9 18.1
Specific allowance 3.4 4.1
Average recorded investment 13.3 19.9
Interest income recognized 0.3 0.2
Commercial | Commercial and Institutional    
Financing Receivable, Impaired [Line Items]    
With no related specific reserve, recorded investment 0.0 0.2
With a related specific reserve, recorded investment 6.8 6.4
With no related specific reserve, unpaid principal balance 0.1 0.4
With a related specific reserve, unpaid principal balance 8.9 7.3
Specific allowance 2.3 3.0
With no related specific reserve, average recorded investment 0.5 6.8
With a related specific reserve, average recorded investment 7.9 4.6
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 2.4 5.8
With a related specific reserve, recorded investment 1.2 2.6
With no related specific reserve, unpaid principal balance 4.4 7.6
With a related specific reserve, unpaid principal balance 1.5 2.8
Specific allowance 1.1 1.1
With no related specific reserve, average recorded investment 3.5 6.4
With a related specific reserve, average recorded investment 1.4 2.1
With no related specific reserve, interest income recognized 0.3 0.2
With a related specific allowance, interest income recognized 0.0 0.0
Personal    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 81.8 101.2
Unpaid principal balance 108.8 132.5
Specific allowance 1.6 3.1
Average recorded investment 106.9 104.7
Interest income recognized 1.9 2.0
Personal | Real Estate    
Financing Receivable, Impaired [Line Items]    
With no related specific reserve, recorded investment 75.6 76.7
With a related specific reserve, recorded investment 5.0 22.8
With no related specific reserve, unpaid principal balance 102.5 104.7
With a related specific reserve, unpaid principal balance 5.1 26.1
Specific allowance 1.6 3.1
With no related specific reserve, average recorded investment 88.5 94.9
With a related specific reserve, average recorded investment 16.7 9.2
With no related specific reserve, interest income recognized 1.8 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 1.2 1.7
With no related specific reserve, unpaid principal balance 1.2 1.7
With no related specific reserve, average recorded investment 1.7 0.6
With no related specific reserve, interest income recognized $ 0.1 $ 0.1