Business Combination and Asset Purchase - Summary of Changes in Accretable Yield or Income Expected to be Collected (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Peoples Federal Savings and Loan [Member]
Business Acquisition [Line Items]
Beginning Balance	$ 0	$ 219	$ 104	$ 335
Accretion	0	(57)	(104)	(173)
Ending Balance	0	162	0	162
Perpetual Federal Savings Bank in 2021 and 2022 [Member]
Business Acquisition [Line Items]
Beginning Balance	0	782	112	1,453
Accretion	0	(335)	(112)	(1,006)
Ending Balance	0	447	0	447
Ossian Financial Services, Inc. [Member]
Business Acquisition [Line Items]
Beginning Balance	0	27	0	107
Additions	0	2	0	2
Accretion	0	(29)	0	(108)
Disposals	0	0	0	(1)
Ending Balance	$ 0	$ 0	$ 0	$ 0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details