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Business Combination & Asset Purchase - Summary of Loans Acquired and Contractually Required Payments Receivable (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2019
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Perpetual Federal Savings Bank [Member] |  |
Business Acquisition [Line Items] |  |
Total required payments receivable | $ 1,407 |
Cash flows expected to be collected at acquisition | 728 |
Basis in acquired loans at acquisition | 965 |
Ossian Financial Services, Inc. [Member] |  |
Business Acquisition [Line Items] |  |
Total required payments receivable | 2,057 |
Cash flows expected to be collected at acquisition | 1,309 |
Basis in acquired loans at acquisition | 1,634 |
Limberlost Bancshares, Inc. [Member] |  |
Business Acquisition [Line Items] |  |
Total required payments receivable |  | $ 4,570
Cash flows expected to be collected at acquisition |  | 2,788
Basis in acquired loans at acquisition |  | 4,396
Consumer Real Estate [Member] | Perpetual Federal Savings Bank [Member] |  |
Business Acquisition [Line Items] |  |
Total required payments receivable | 962 |
Consumer Real Estate [Member] | Ossian Financial Services, Inc. [Member] |  |
Business Acquisition [Line Items] |  |
Total required payments receivable | 28 |
Consumer Real Estate [Member] | Limberlost Bancshares, Inc. [Member] |  |
Business Acquisition [Line Items] |  |
Total required payments receivable |  | 261
Agricultural Real Estate [Member] | Perpetual Federal Savings Bank [Member] |  |
Business Acquisition [Line Items] |  |
Total required payments receivable | 146 |
Agricultural Real Estate [Member] | Ossian Financial Services, Inc. [Member] |  |
Business Acquisition [Line Items] |  |
Total required payments receivable | 1,142 |
Commercial Real Estate [Member] | Perpetual Federal Savings Bank [Member] |  |
Business Acquisition [Line Items] |  |
Total required payments receivable | 293 |
Commercial Real Estate [Member] | Ossian Financial Services, Inc. [Member] |  |
Business Acquisition [Line Items] |  |
Total required payments receivable | 527 |
Consumer [Member] | Perpetual Federal Savings Bank [Member] |  |
Business Acquisition [Line Items] |  |
Total required payments receivable | 6 |
Consumer [Member] | Limberlost Bancshares, Inc. [Member] |  |
Business Acquisition [Line Items] |  |
Total required payments receivable |  | 94
Commercial and Industrial [Member] | Ossian Financial Services, Inc. [Member] |  |
Business Acquisition [Line Items] |  |
Total required payments receivable | $ 360 |
Commercial [Member] | Limberlost Bancshares, Inc. [Member] |  |
Business Acquisition [Line Items] |  |
Total required payments receivable |  | $ 4,215

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