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Business Combination & Asset Purchase - Summary of Changes in Accretable Yield or Income Expected to be Collected (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Peoples Federal Savings and Loan [Member]    
Business Acquisition [Line Items]    
Additions $ 856  
Accretion (58)  
Ending Balance 798  
Perpetual Federal Savings Bank [Member]    
Business Acquisition [Line Items]    
Beginning Balance 5,262  
Additions 294 $ 5,592
Accretion (1,318) (330)
Disposals (2)  
Ending Balance 4,236 5,262
Ossian Financial Services, Inc. [Member]    
Business Acquisition [Line Items]    
Beginning Balance 645  
Additions 1 762
Accretion (176) (117)
Ending Balance 470 645
Limberlost Bancshares, Inc. [Member]    
Business Acquisition [Line Items]    
Beginning Balance 1,198 1,653
Additions 13 17
Accretion (426) (431)
Disposals   (41)
Ending Balance $ 785 $ 1,198