Summary of Significant Accounting Policies - Additional Information (Detail)				1 Months Ended	9 Months Ended
	Nov. 30, 2023 USD ($)	Feb. 21, 2023 USD ($) $ / shares shares	Jan. 01, 2023 USD ($)	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) Location $ / shares	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) $ / shares	Sep. 17, 2018
Accounting Policies [Line Items]
Date of incorporation					Apr. 06, 2018
Net proceeds from issuance of common stock					$ 99,000	$ 9,980,000
Common stock, par value | $ / shares					$ 0.01		$ 0.01
Retained earnings					$ 15,147,000		$ 4,843,000
Accrued interest receivable on held-to-maturity debt securities					180,000
Accrued interest receivable on available for sale debt securities					710,000
Allowance on held-to-maturity securities					471,000		512,000
Loans receivable					$ 2,189,326,000		$ 2,104,517,000
IPO [Member]
Accounting Policies [Line Items]
Sale of common stock | shares				5,101,205
Offering price per share | $ / shares				$ 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 | shares		1,282,052
Offering price per share | $ / shares		$ 7.8
Underwriting discounts and commissions		$ 0
Common stock, par value | $ / shares		$ 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%
AHFCU [Member]
Accounting Policies [Line Items]
Purchase and assumption agreement date					May 09, 2024
Number of branch locations | Location					3
Percentage of deposits assumed at closing					7.00%
Loans receivable					$ 102,300,000
Assets held for sale, deposits					$ 94,000,000