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Proposed Business Combination - Additional Information (Detail)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Office
Dec. 31, 2017
USD ($)
shares
Proposed Business Combination [Line Items]      
Assets $ 1,108,012   $ 1,107,009
Loans, net 831,943   816,156
Deposits 928,859   919,340
Consolidated equity $ 139,347   $ 134,137
Common stock, shares outstanding | shares 10,400,000   10,400,000
Limberlost Bancshares, Inc. [Member]      
Proposed Business Combination [Line Items]      
Common stock, shares outstanding | shares 1,000    
Limberlost Bancshares, Inc. [Member]      
Proposed Business Combination [Line Items]      
Common stock issued in exchange of each outstanding share | shares 1,830    
Cash payment for exchange of each share | $ / shares $ 8,465    
Aggregate transaction value $ 88,765    
Limberlost Bancshares, Inc. [Member] | Bank of Geneva [Member] | Northeast Indiana [Member]      
Proposed Business Combination [Line Items]      
Number of full-service offices | Office   6  
Assets   $ 287,000  
Loans, net   257,000  
Deposits   212,000  
Consolidated equity   $ 30,600