Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2022	Aug. 31, 2022	Sep. 18, 2021	Sep. 17, 2018
Accounting Policies [Line Items]
Date of incorporation	Apr. 06, 2018
Net proceeds from issuance of common stock	$ 34,659,000
Goodwill impairment	$ 0
Residential loans [Member]
Accounting Policies [Line Items]
Number of days past due for loans to be declared as deliquent	180 days
Consumer loans [Member]
Accounting Policies [Line Items]
Number of days past due for loans to be declared as deliquent	120 days
Stonebridge Bank [Member]
Accounting Policies [Line Items]
Business acquistion percentage of voting interests acquired				100.00%
GNB Investments, Inc [Member]
Accounting Policies [Line Items]
Business acquistion percentage of voting interests acquired			100.00%
Initial Public Offering [Member]
Accounting Policies [Line Items]
Shares of common stock issued and sold	5,101,205
Offering price per share	$ 7.50	$ 9.32
Net proceeds from issuance of common stock	$ 34,659,000
Underwriting discounts and commissions	2,487,000
Other offering expenses	$ 1,114,000