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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 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Perpetual Federal Savings Bank [Member]          
Business Acquisition [Line Items]          
Beginning Balance $ 4,710   $ 5,262    
Additions 28   125    
Accretion (330)   (979)    
Disposals (2)   (2)    
Ending Balance 4,406   4,406   $ 5,262
Ossian Financial Services, Inc. [Member]          
Business Acquisition [Line Items]          
Beginning Balance 557 $ 733 645    
Additions 1   1 $ 762  
Accretion (44) (44) (132) (73)  
Ending Balance 514 689 514 689 645
Limberlost Bancshares, Inc. [Member]          
Business Acquisition [Line Items]          
Beginning Balance 994 1,439 1,198 1,653 1,653
Additions 2 3 10 8  
Accretion (107) (108) (319) (323)  
Disposals       (4)  
Ending Balance $ 889 $ 1,334 $ 889 $ 1,334 $ 1,198