Allowance for Credit Losses on Loans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2023 USD ($) Loan	Dec. 31, 2022 USD ($) Contract
Receivables [Abstract]
Financing receivable recorded investment number of days past due	90 days
Accruing Loans 90 or More Days Past Due	$ 0	$ 0
Collateral dependent loans balance minimum threshold for individual assessment	100,000
Financing receivable, Revolving, converted to term loans	$ 1,200,000
Number of loans issued to borrowers | Loan	0
TDR is defined as being past due	90 days
TDRs outstanding		2,800,000
Outstanding balance of TDRs non accrual basis		$ 52,000
Number of contracts on non-accruing basis | Contract		2