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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Peoples Federal Savings and Loan [Member]        
Business Acquisition [Line Items]        
Beginning Balance $ 219 $ 450 $ 335 $ 566
Additions 0 0 0 0
Accretion (57) (58) (173) (174)
Reclassification from nonaccretable difference 0 0 0 0
Disposals 0 0 0 0
Ending Balance 162 392 162 392
Perpetual Federal Savings Bank [Member]        
Business Acquisition [Line Items]        
Beginning Balance 782 2,124 1,453 2,795
Additions 0 0 0 0
Accretion (335) (335) (1,006) (1,006)
Reclassification from nonaccretable difference 0 0 0 0
Disposals 0 0 0 0
Ending Balance 447 1,789 447 1,789
Ossian Financial Services, Inc. [Member]        
Business Acquisition [Line Items]        
Beginning Balance 27 206 107 294
Additions 2 0 2 0
Accretion (29) (44) (108) (132)
Reclassification from nonaccretable difference 0 0 0 0
Disposals 0 0 (1) 0
Ending Balance 0 162 0 162
Limberlost Bancshares, Inc. [Member]        
Business Acquisition [Line Items]        
Beginning Balance 0 146 0 363
Additions 0 0 0 0
Accretion 0 (109) 0 (327)
Reclassification from nonaccretable difference 0 0 0 1
Disposals 0 0 0 0
Ending Balance $ 0 $ 37 $ 0 $ 37