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Proposed Business Combination - Additional Information (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended
Dec. 21, 2020
USD ($)
$ / shares
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Office
Business Acquisition [Line Items]      
Business combination, acquisition related costs   $ 180  
Consulting Fees [Member]      
Business Acquisition [Line Items]      
Business combination, acquisition related costs   74  
Other General and Administrative Expenses [Member]      
Business Acquisition [Line Items]      
Business combination, acquisition related costs   $ 106  
Ossian Financial Services, Inc [Member]      
Business Acquisition [Line Items]      
Business acquisition, date of acquisition agreement   Dec. 21, 2020  
Assets     $ 122,000
Loans     58,000
Deposits     108,000
Consolidated equity     $ 11,900
Business acquisition, expected closing date   Apr. 30, 2021  
Aggregate cash consideration $ 20,000    
Share price | $ / shares $ 67.71    
Ossian Financial Services, Inc [Member] | Maximum [Member]      
Business Acquisition [Line Items]      
Total consideration for acquisition $ 12,000    
Ossian Financial Services, Inc [Member] | Northeast Indiana [Member]      
Business Acquisition [Line Items]      
Number of full-service offices | Office     2