Loans and Leases Impaired Collateral (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 332,117	$ 256,410
Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	106,026	59,550
Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	226,091	196,860
Collateral Value
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	362,368	109,810
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	143,415	102,254
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	21,219	10,682
Commercial Portfolio Segment [Member] | Commercial and Industrial Sector [Member] | Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	122,196	91,572
Commercial Portfolio Segment [Member] | Asset Based Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	137	139
Commercial Portfolio Segment [Member] | Asset Based Loans [Member] | Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	0
Commercial Portfolio Segment [Member] | Asset Based Loans [Member] | Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	137	139
Commercial Portfolio Segment [Member] | Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	24,509	23,297
Commercial Portfolio Segment [Member] | Commercial Real Estate | Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	20,157	14,097
Commercial Portfolio Segment [Member] | Commercial Real Estate | Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	4,352	9,200
Commercial Portfolio Segment [Member] | 6172 Finance Lessors
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	8,951	5,433
Commercial Portfolio Segment [Member] | 6172 Finance Lessors | Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	0
Commercial Portfolio Segment [Member] | 6172 Finance Lessors | Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	8,951	5,433
Commercial Portfolio Segment [Member] | Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		90,096
Consumer Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		256,410
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	105,460	90,096
Consumer Portfolio Segment [Member] | Residential Mortgage [Member] | Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	36,663	17,635
Consumer Portfolio Segment [Member] | Residential Mortgage [Member] | Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	68,797	72,461
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	48,612	35,191
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	27,987	17,136
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	20,625	18,055
Consumer Portfolio Segment [Member] | Consumer Loan
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	1,033	0
Consumer Portfolio Segment [Member] | Consumer Loan | Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	0
Consumer Portfolio Segment [Member] | Consumer Loan | Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 1,033	$ 0