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Loans and Leases Loans and Leases (Information on TDRs with subsequent default) (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
loan
Mar. 31, 2019
loan
Dec. 31, 2019
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Amortized Cost With Allowance $ 158,378    
Related Valuation Allowance 13,012    
Unpaid Principal Balance $ 464,990    
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loan 0 0  
Impaired Financing Receivable, Recorded Investment $ 332,117   $ 256,410
Amortized Cost No Allowance 173,739    
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Amortized Cost With Allowance 90,383   72,515
Related Valuation Allowance 6,527   7,862
Unpaid Principal Balance 188,458   140,096
Impaired Financing Receivable, Recorded Investment 143,415   102,254
Amortized Cost No Allowance 53,032   29,739
Commercial Portfolio Segment [Member] | Asset Based Loans [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Impaired Financing Receivable, Recorded Investment 137   139
Commercial Portfolio Segment [Member] | Commercial Real Estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Amortized Cost With Allowance 8,810   8,479
Related Valuation Allowance 1,044   1,143
Unpaid Principal Balance 30,540   29,292
Impaired Financing Receivable, Recorded Investment 24,509   23,297
Amortized Cost No Allowance 15,699   14,818
Commercial Portfolio Segment [Member] | 6172 Finance Lessors      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Amortized Cost With Allowance 8,402   3,274
Related Valuation Allowance 661   418
Unpaid Principal Balance 9,063   5,591
Impaired Financing Receivable, Recorded Investment 8,951   5,433
Amortized Cost No Allowance 549   2,159
Commercial Portfolio Segment [Member] | Residential Mortgage [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Amortized Cost With Allowance     33,865
Related Valuation Allowance     3,618
Unpaid Principal Balance     98,790
Impaired Financing Receivable, Recorded Investment     90,096
Amortized Cost No Allowance     56,231
Consumer Portfolio Segment [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Amortized Cost With Allowance     125,791
Related Valuation Allowance     14,249
Unpaid Principal Balance     312,737
Impaired Financing Receivable, Recorded Investment     256,410
Amortized Cost No Allowance     130,619
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Amortized Cost With Allowance 36,672    
Related Valuation Allowance 3,438    
Unpaid Principal Balance 119,579    
Impaired Financing Receivable, Recorded Investment 105,460   90,096
Amortized Cost No Allowance 68,788    
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Amortized Cost With Allowance 13,006   7,519
Related Valuation Allowance 1,137   1,203
Unpaid Principal Balance 114,212   38,503
Impaired Financing Receivable, Recorded Investment 48,612   35,191
Amortized Cost No Allowance 35,606   27,672
Consumer Portfolio Segment [Member] | Consumer Loan      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Amortized Cost With Allowance 968   0
Related Valuation Allowance 202   0
Unpaid Principal Balance 2,675   0
Impaired Financing Receivable, Recorded Investment 1,033   0
Amortized Cost No Allowance $ 65   $ 0