Loans and Leases Impaired Collateral (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 323,156	$ 256,410
Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	103,375	59,550
Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	219,781	196,860
Collateral Value
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	143,600	109,800
Commercial Portfolio Segment [Member] | Commercial non-mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	129,552	102,254
Commercial Portfolio Segment [Member] | Commercial non-mortgage | Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	16,028	10,682
Commercial Portfolio Segment [Member] | Commercial non-mortgage | Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	113,524	91,572
Commercial Portfolio Segment [Member] | Asset-based
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	138	139
Commercial Portfolio Segment [Member] | Asset-based | Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	0
Commercial Portfolio Segment [Member] | Asset-based | Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	138	139
Commercial Portfolio Segment [Member] | Commercial real estate
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	27,526	23,297
Commercial Portfolio Segment [Member] | Commercial real estate | Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	19,146	14,097
Commercial Portfolio Segment [Member] | Commercial real estate | Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	8,380	9,200
Commercial Portfolio Segment [Member] | Equipment financing
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	7,794	5,433
Commercial Portfolio Segment [Member] | Equipment financing | Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	0
Commercial Portfolio Segment [Member] | Equipment financing | Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	7,794	5,433
Commercial Portfolio Segment [Member] | Residential
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
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	106,772	90,096
Consumer Portfolio Segment [Member] | Residential | Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	37,708	17,635
Consumer Portfolio Segment [Member] | Residential | Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	69,064	72,461
Consumer Portfolio Segment [Member] | Home equity
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	50,157	35,191
Consumer Portfolio Segment [Member] | Home equity | Collateral Pledged
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	30,493	17,136
Consumer Portfolio Segment [Member] | Home equity | Uncollateralized
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	19,664	18,055
Consumer Portfolio Segment [Member] | Consumer Loan
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	1,217	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	$ 1,217	$ 0