Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)				1 Months Ended	3 Months Ended
	Nov. 30, 2023	Feb. 21, 2023	Jan. 01, 2023	Sep. 30, 2022	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Sep. 17, 2018
Accounting Policies [Line Items]
Date of incorporation					Apr. 06, 2018
Net proceeds from issuance of common stock					$ 54,000	$ 9,980,000
Common stock, par value					$ 0.01		$ 0.01
Retained earnings					$ 7,724,000		$ 4,843,000
Accrued interest receivable on held-to-maturity debt securities					187,000
Accrued interest receivable on available for sale debt securities					726,000
Allowance on held-to-maturity securities					$ 507,000		$ 512,000
IPO [Member]
Accounting Policies [Line Items]
Sale of common stock				5,101,205
Offering price per share				$ 7.5
Net proceeds from issuance of common stock				$ 34,659,000
Underwriting discounts and commissions				2,487,000
Other offering expenses				$ 1,114,000
Private Placement [Member]
Accounting Policies [Line Items]
Net proceeds from issuance of common stock	$ 10,000,000
Investment Agreement [Member]
Accounting Policies [Line Items]
Sale of common stock		1,282,052
Offering price per share		$ 7.8
Underwriting discounts and commissions		$ 0
Common stock, par value		$ 0.01
Gross proceeds from issuance of common stock		$ 10,000,000
ASU 2017-04 [Member]
Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adoption Date					Jan. 01, 2023
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]					true
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]					true
ASU 2022-01 [Member]
Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adoption Date					Jan. 01, 2023
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]					true
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]					true
ASU 2016-13 [Member]
Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adoption Date					Jan. 01, 2023
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]					true
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]					true
ASU 2016-13 [Member] | Cumulative Effect Adjustment [Member]
Accounting Policies [Line Items]
Increase in allowance for credit losses			$ 5,700,000
Retained earnings			(5,400,000)
Unfunded commitments to allowance for credit losses			910,000
Allowance on held-to-maturity securities			602,000
PCD assets, allowance for credit loss			$ 308,000
Stonebridge Bank [Member]
Accounting Policies [Line Items]
Business acquistion percentage of voting interests acquired								100.00%