Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)				1 Months Ended	3 Months Ended	9 Months Ended
	Feb. 22, 2023	Feb. 21, 2023	Jan. 01, 2023	Sep. 30, 2022	Mar. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Aug. 31, 2022	Sep. 17, 2018
Accounting Policies [Line Items]
Date of incorporation						Apr. 06, 2018
Net proceeds from issuance of common stock						$ 9,980,000	$ 34,659,000
Goodwill impairment					$ 0
Total assets						1,255,695,000		$ 1,163,654,000
Total deposits						$ 1,041,772,000		$ 946,772,000
Common Stock, Shares, Outstanding						16,235,871		14,939,640
Common stock, par value						$ 0.01		$ 0.01
Retained earnings						$ 19,062,000		$ 27,100,000
Accrued interest receivable on held-to-maturity debt securities						187,000
Accrued interest receivable on available for sale debt securities						489,000
Allowance on held-to-maturity securities						$ 512,000
IPO [Member]
Accounting Policies [Line Items]
Shares of common stock issued and sold				5,101,205
Offering price per share				$ 7.5			$ 7.5		$ 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
Investment Agreement [Member]
Accounting Policies [Line Items]
Shares of common stock issued and sold		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
Partners Bancorp [Member]
Accounting Policies [Line Items]
Partners merger agreement date	Feb. 22, 2023
Total assets								1,570,000,000
Total loans								1,230,000,000
Total deposits								$ 1,340,000,000
Common Stock, Shares, Outstanding								17,973,724
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)
Allowance for credit losses for unfunded loan commitments			910,000
Allowance on held-to-maturity securities			602,000
PCD assets, allowance for credit loss			$ 308,000
Residential loans [Member]
Accounting Policies [Line Items]
Number of days past due for loans to be declared as deliquent						180 days
Consumer [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%
Accrued Interest Receivable and Other Assets [Member]
Accounting Policies [Line Items]
Accrued interest receivable on loans						$ 4,073,000