Business Combination and Asset Purchase - Summary of Consideration Paid and Amounts of Assets Acquired and Liabilities Assumed Recognized (Detail) - USD ($) $ in Thousands	Oct. 01, 2022	Sep. 30, 2024	Dec. 31, 2023
Assets
Goodwill		$ 86,358	$ 86,358
Peoples Federal Savings And Loan [Member]
Business Acquisition [Line Items]
Cash	$ 9,806
Common Shares	13,446
Treasury stock repurchased	(3)
Total	23,249
Assets
Cash and cash equivalents	18,881
Other securities, at cost	1,271
Loans, net	101,755
Premises and equipment	1,906
Goodwill	5,924
Other assets	12,081
Total Assets Purchased	141,818
Deposits
Noninterest bearing	7,139
Interest bearing	104,719
Total deposits	111,858
Federal Home Loan Bank (FHLB) advances	896
Accrued expenses and other liabilities	5,815
Total Liabilities Assumed	$ 118,569