Allowance for Credit Losses - Additional Information (Detail)	3 Months Ended		12 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($) SecurityLoan	Dec. 31, 2022 USD ($)	Jan. 01, 2023 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Increase in allowance for credit losses	$ 4,300,000
Allowance for credit losses	34,196,000		$ 28,511,000
Provision for credit losses	$ 620,000	$ 300,000
Number of days reaching where loans are considered for nonaccrual status	90 days
Conditions where loans are considered for nonaccrual status	A loan may be returned to accruing status only if one of two conditions are met: the loan is well-secured and none of the principal and interest has been past due for a minimum of 90 days or the principal and interest payments are reasonably assured and a sustained period of performance has occurred, generally six months.
Loans modified as troubled debt restructuring	$ 0		0
Defaulted loans | SecurityLoan		0
Individually evaluated loans	greater than $350
Allowance for loan losses recorded for acquired loans	$ 0		0
Foreclosed assets	26,000		0
CECL Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Increase in allowance for credit losses	5,193,000
ASU 2016-13 [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance for credit losses				$ 37,861,000
ASU 2016-13 [Member] | CECL Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance for credit losses				$ 7,682,000
Residential Mortgage [Member]
Accounts Notes And Loans Receivable [Line Items]
Residential mortgages in process of foreclosure	210,000		399,000
TDRs [Member]
Accounts Notes And Loans Receivable [Line Items]
Allowance for credit losses			$ 7,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | ASU 2016-13 [Member]
Accounts Notes And Loans Receivable [Line Items]
Increase allowance of credit loss	$ 5,193,000