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Business Combination and Asset Purchase - Summary of Changes in Accretable Yield or Income Expected to be Collected (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Peoples Federal Savings and Loan [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Beginning Balance | $ 508 | $ 741 | $ 566 | $ 798
Additions |  | 3 |  | 4
Accretion | (58) | (58) | (116) | (116)
Disposals |  | (6) |  | (6)
Ending Balance | 450 | 680 | 450 | 680
Perpetual Federal Savings Bank [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Beginning Balance | 2,460 | 3,906 | 2,795 | 4,236
Additions |  | 11 |  | 25
Accretion | (336) | (345) | (671) | (689)
Ending Balance | 2,124 | 3,572 | 2,124 | 3,572
Ossian Financial Services, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Beginning Balance | 250 | 426 | 294 | 470
Accretion | (44) | (44) | (88) | (88)
Ending Balance | 206 | 382 | 206 | 382
Limberlost Bancshares, Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Beginning Balance | 254 | 681 | 363 | 785
Additions |  | 2 |  | 5
Accretion | (109) | (108) | (218) | (215)
Reclassification from nonaccretable difference | 1 |  | 1 |
Ending Balance | $ 146 | $ 575 | $ 146 | $ 575

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-5 + Details
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