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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 |

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