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Loans and Allowance for Credit Losses on Loans - Additional Information (Detail)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2023 USD ($) Loan	Dec. 31, 2022 USD ($) Loan
Loans collateralized by real estate	$ 1	$ 1
Loans outstanding	5,500,000	$ 5,500,000	$ 4,400,000
Number of Loans | Loan		0	0
Interest income recognized on non-accrual loans	0	$ 0
Non-Accrual Loans	$ 3,000	$ 3,000	$ 89,000
ASU 2016-13
Change in accounting principle, accounting standards update, adopted	true	true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2023	Jan. 01, 2023
Residential Real Estate [Member]
Loans collateralized by real estate	$ 0	$ 0	0
RES [Member]
Non-Accrual Loans	$ 84,000	84,000	$ 84,000
RES [Member] | Residential Real Estate [Member]
Real estate appraial value		$ 422,000

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