Borrowings and Subordinated Notes - Additional Information (Detail)		12 Months Ended
	Jul. 30, 2021 USD ($)	Dec. 31, 2023 USD ($) Loan	Dec. 31, 2022 USD ($)	Mar. 31, 2023 USD ($)	Sep. 29, 2022 USD ($)
Debt Instrument [Line Items]
Number of loans secured | Loan		2
Term note		$ 30,000,000
Line of credit		$ 10,000,000		$ 10,000,000	$ 10,000,000
Percentage of interest on loan accrued rate		2.50%
Percentage of line of credit accrues rate					5.50%
Maturity date		Sep. 30, 2023
Total borrowings excluding for fair value related to acquisition		$ 265,773,000	$ 127,400,000
Total borrowings, fair value related to acquisition		23,000	47,000
Advances, secured by mortgage loans			659,000
Unsecured borrowings through correspondent banks		128,000,000	73,000,000.0
Borrowing capacity under the Federal Reserve's BTFP		69,900,000
Unpledged securities which could be sold or used as collateral		97,300,000	249,600,000
Additional borrowings available from the Federal Home Loan Bank based on current pledging		42,500,000	2,000,000
Debt instrument basis points	2.63%
Debt instrument, frequency of periodic payment	semi-annually
Term of loan	5 years
Redemption price of principal amount of notes redeemed	100.00%
Prime Rate [Member]
Debt Instrument [Line Items]
Variable line of credit		$ 15,000,000
Maturity date		Sep. 27, 2024
Private Placement
Debt Instrument [Line Items]
Subordinated notes	$ 35,000,000
Fixed-to-floating interest rate	3.25%
Subordinated notes, due date	Jul. 30, 2031
Percentage of notes prices on principal amount	100.00%
Peoples Federal Savings and Loan Association [Member]
Debt Instrument [Line Items]
Bank undertook amount		$ 965,000
Peoples Federal Savings and Loan Association [Member] | Minimum [Member]
Debt Instrument [Line Items]
Bank loan maturity year		2022
Peoples Federal Savings and Loan Association [Member] | Maximum [Member]
Debt Instrument [Line Items]
Bank loan maturity year		2028
Perpetual Federal Savings Bank {Member]
Debt Instrument [Line Items]
Bank undertook amount		$ 6,000,000
Collateral Pledged [Member] | Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Pledging of eligible commercial real estate loans		158,900,000
Asset Pledged as Collateral without Right [Member] | Federal Home Loan Bank Advances [Member] | 1-4 Family Real Estate Loans [Member]
Debt Instrument [Line Items]
Advances, secured by mortgage loans		223,000
Asset Pledged as Collateral without Right [Member] | Federal Home Loan Bank Advances [Member] | HALOC [Member]
Debt Instrument [Line Items]
Advances, secured by mortgage loans			232,900
Cash Management Advance
Debt Instrument [Line Items]
Unsecured borrowings through correspondent banks		$ 150,100,000	$ 130,400,000
Term Note [Member]
Debt Instrument [Line Items]
Short term debt, term		12-month
Line of Credit [Member]
Debt Instrument [Line Items]
Short term debt, term		12-month
Outstanding borrowings		$ 0