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	12 Months Ended
	Mar. 31, 2022 USD ($) contract	Dec. 31, 2022 loan
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts	7	257
Pre-Modification Outstanding Recorded Investment	$ 784
Post-Modification Modification Outstanding Recorded Investment	$ 792
Commercial and industrial | Commercial Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts | loan		11
Business banking | Commercial Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts	5	33
Pre-Modification Outstanding Recorded Investment	$ 440
Post-Modification Modification Outstanding Recorded Investment	$ 448
Residential real estate | Residential Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts	1	142
Pre-Modification Outstanding Recorded Investment	$ 134
Post-Modification Modification Outstanding Recorded Investment	$ 134
Consumer home equity | Consumer Portfolio Segment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of Contracts	1	70
Pre-Modification Outstanding Recorded Investment	$ 210
Post-Modification Modification Outstanding Recorded Investment	$ 210