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Loans and Leases (Summary Of Loan And Lease Portfolio Aging By Class Of Loan) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual $ 193,766 $ 189,199  
90 or More Days Past Due and Accruing 0 104  
Non-accrual 151,059 154,767  
Current 19,843,220 18,276,290  
Total Loans and Leases 20,036,986 18,465,489 $ 17,523,858
Residential Portfolio Segment [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 56,800 62,002  
90 or More Days Past Due and Accruing 0 0  
Non-accrual 43,193 49,188  
Current 4,915,885 4,354,635  
Total Loans and Leases 4,972,685 4,416,637 4,490,878
Consumer Portfolio Segment [Member]      
Financing Receivable, Past Due [Line Items]      
Total Loans and Leases 2,234,124 2,396,704 2,590,225
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 43,988 48,130  
90 or More Days Past Due and Accruing 0 0  
Non-accrual 30,170 33,495  
Current 1,970,556 2,121,049  
Total Loans and Leases 2,014,544 2,169,179  
Consumer Portfolio Segment [Member] | Consumer Borrower [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 6,268 4,225  
90 or More Days Past Due and Accruing 0 0  
Non-accrual 1,192 1,494  
Current 213,312 223,300  
Total Loans and Leases 219,580 227,525  
Commercial Portfolio Segment [Member]      
Financing Receivable, Past Due [Line Items]      
Total Loans and Leases 6,343,497 6,216,606 5,368,694
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 62,080 57,627  
90 or More Days Past Due and Accruing 0 104  
Non-accrual 59,369 55,810  
Current 5,234,531 5,189,808  
Total Loans and Leases 5,296,611 5,247,435  
Commercial Portfolio Segment [Member] | Asset Based Loans [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 139 224  
90 or More Days Past Due and Accruing 0 0  
Non-accrual 139 224  
Current 1,046,747 968,947  
Total Loans and Leases 1,046,886 969,171  
Commercial Real Estate Portfolio Segment [Member]      
Financing Receivable, Past Due [Line Items]      
Total Loans and Leases 5,949,339 4,927,145 4,523,828
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 1,613 0  
90 or More Days Past Due and Accruing 0 0  
Non-accrual 1,613 0  
Current 222,127 218,831  
Total Loans and Leases 223,740 218,831  
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 11,660 9,762  
90 or More Days Past Due and Accruing 0 0  
Non-accrual 9,950 8,242  
Current 5,713,939 4,698,552  
Total Loans and Leases 5,725,599 4,708,314  
Finance Leases Portfolio Segment [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 11,218 7,229  
90 or More Days Past Due and Accruing 0 0  
Non-accrual 5,433 6,314  
Current 526,123 501,168  
Total Loans and Leases 537,341 508,397 $ 550,233
Financial Asset, 30 to 59 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 28,545 22,333  
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 7,166 8,513  
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 8,267 9,250  
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Consumer Borrower [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 4,269 1,774  
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 2,094 1,011  
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Asset Based Loans [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 0 0  
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 0 0  
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 1,256 1,275  
Financial Asset, 30 to 59 Days Past Due [Member] | Finance Leases Portfolio Segment [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 5,493 510  
Financial Asset, 60 to 89 Days Past Due [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 14,162 11,995  
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 6,441 4,301  
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Home Equity Loan [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 5,551 5,385  
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] | Consumer Borrower [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 807 957  
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 617 702  
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Asset Based Loans [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 0 0  
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 0 0  
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual 454 245  
Financial Asset, 60 to 89 Days Past Due [Member] | Finance Leases Portfolio Segment [Member]      
Financing Receivable, Past Due [Line Items]      
Total Past Due and Non-accrual $ 292 $ 405