Loans and Allowance for Credit Losses - Summary of the Modifications Which Occurred During the Periods and the Change in the Recorded Investment Subsequent to the Modifications Occurring (Detail) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023 USD ($) contract	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) contract	Jun. 30, 2022 USD ($)	Dec. 31, 2022 loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts	10		17		257
Pre- Modification Outstanding Recorded Investment	$ 3,165		$ 3,949
Post-Modification Modification Outstanding Recorded Investment	$ 3,165	$ 3,165	$ 3,957	$ 3,957
Commercial and industrial | Commercial Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts	1		1		11
Pre- Modification Outstanding Recorded Investment	$ 2,418		$ 2,418
Post-Modification Modification Outstanding Recorded Investment	$ 2,418		$ 2,418
Business banking | Commercial Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts	6		11		33
Pre- Modification Outstanding Recorded Investment	$ 130		$ 570
Post-Modification Modification Outstanding Recorded Investment	$ 130		$ 578
Residential real estate | Residential Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts	2		3		142
Pre- Modification Outstanding Recorded Investment	$ 595		$ 729
Post-Modification Modification Outstanding Recorded Investment	$ 595		$ 729
Consumer home equity | Consumer Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts	1		2		70
Pre- Modification Outstanding Recorded Investment	$ 22		$ 232
Post-Modification Modification Outstanding Recorded Investment	$ 22		$ 232