Loans and Leases (Information on How Loans and Leases were Modified as a TDR) (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) loan	Sep. 30, 2021 USD ($) loan	Sep. 30, 2022 USD ($) loan	Sep. 30, 2021 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	30	6	82	49
Recorded Investment | $	$ 20,135	$ 295	$ 50,582	$ 4,113
Commercial | Extended maturity | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	1	1	3	8
Recorded Investment | $	$ 24	$ 48	$ 121	$ 605
Commercial | Extended maturity | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	0	0	0	1
Recorded Investment | $	$ 0	$ 0	$ 0	$ 183
Commercial | Maturity/rate combined | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	3	2	8	8
Recorded Investment | $	$ 322	$ 94	$ 765	$ 304
Commercial | Other | Commercial non-mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	15	0	16	3
Recorded Investment | $	$ 17,408	$ 0	$ 40,372	$ 114
Commercial | Other | Equipment financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	0	0	1	0
Recorded Investment | $	$ 0	$ 0	$ 1,157	$ 0
Consumer | Extended maturity | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	0	0	1	1
Recorded Investment | $	$ 0	$ 0	$ 893	$ 99
Consumer | Extended maturity | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	0	0	0	1
Recorded Investment | $	$ 0	$ 0	$ 0	$ 28
Consumer | Maturity/rate combined | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	1	0	1	2
Recorded Investment | $	$ 124	$ 0	$ 124	$ 401
Consumer | Maturity/rate combined | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	3	0	14	6
Recorded Investment | $	$ 1,515	$ 0	$ 2,239	$ 1,025
Consumer | Adjusted interest rate | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	0	0	1	0
Recorded Investment | $	$ 0	$ 0	$ 74	$ 0
Consumer | Other | Residential
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	1	0	7	2
Recorded Investment | $	$ 298	$ 0	$ 3,060	$ 233
Consumer | Other | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan	6	3	30	17
Recorded Investment | $	$ 444	$ 153	$ 1,777	$ 1,121