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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, 2021
Dec. 31, 2020
Perpetual Federal Savings Bank [Member]    
Business Acquisition [Line Items]    
Additions $ 5,592  
Accretion (330)  
Ending Balance 5,262  
Ossian Financial Services, Inc. [Member]    
Business Acquisition [Line Items]    
Additions 762  
Accretion (117)  
Ending Balance 645  
Limberlost Bancshares, Inc. [Member]    
Business Acquisition [Line Items]    
Beginning Balance 1,653 $ 2,021
Additions 17 3
Accretion (431) (427)
Reclassification from nonaccretable difference   62
Disposals (41) (6)
Ending Balance $ 1,198 $ 1,653