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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 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Perpetual Federal Savings Bank [Member]      
Business Acquisition [Line Items]      
Beginning Balance $ 5,262    
Additions 64    
Accretion (322)    
Ending Balance 5,004   $ 5,262
Ossian Financial Services, Inc. [Member]      
Business Acquisition [Line Items]      
Beginning Balance 645    
Accretion (44)    
Ending Balance 601   645
Limberlost Bancshares, Inc. [Member]      
Business Acquisition [Line Items]      
Beginning Balance 1,198 $ 1,653 1,653
Additions 5 1  
Accretion (106) (108)  
Disposals   (4)  
Ending Balance $ 1,097 $ 1,542 $ 1,198