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Proposed Business Combination - Additional Information (Detail) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 04, 2021 $ / shares shares | May 03, 2021 USD ($) $ / shares | Sep. 30, 2021 USD ($) Office shares | Sep. 30, 2021 USD ($) Office shares | Dec. 31, 2020 USD ($) shares | Mar. 31, 2021 USD ($) shares
Business Acquisition [Line Items] |  |  |  |  |  |
Common stock shares outstanding | shares |  |  | 12,230,000 | 12,230,000 | 12,230,000 |
Business combination, acquisition related costs |  |  | $ 1,200,000 | $ 2,100,000 | $ 42,500 |
Consulting Fees [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, acquisition related costs |  |  | 10,300 | 255,200 | 12,500 |
Other General and Administrative Expenses [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, acquisition related costs |  |  | 61,500 | $ 241,300 | $ 30,000.0 |
Perpetual Federal Savings Bank {Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition, date of acquisition agreement |  |  |  | May 04, 2021 |  |
Assets |  |  |  |  |  | $ 391,000,000
Loans |  |  |  |  |  | 326,000,000
Deposits |  |  |  |  |  | 305,000,000
Tangible equity |  |  |  |  |  | $ 79,000,000
Business acquisition, expected closing date | Oct. 01, 2021 |  |  |  |  |
Aggregate cash consideration |  | $ 103,700,000 |  |  |  |
Stock issuable to PFSB | shares | 1,776 |  |  |  |  |
Cash payment for exchange of each share | $ / shares | $ 41.20 |  |  |  |  |
Common stock shares outstanding | shares |  |  |  |  |  | 2,470,032
Share price | $ / shares |  | $ 24.22 |  |  |  |
Business acquisition subjected to adjustment based upon shares issued in merger | shares | 1,833,999 |  |  |  |  |
Business combination, acquisition related costs |  |  | 275,400 | $ 523,500 |  |
Perpetual Federal Savings Bank {Member] | Consulting Fees [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, acquisition related costs |  |  | 69,000.0 | 160,800 |  |
Perpetual Federal Savings Bank {Member] | Other General and Administrative Expenses [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, acquisition related costs |  |  | $ 206,300 | $ 362,700 |  |
Perpetual Federal Savings Bank {Member] | Urbana Ohio [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of full-service offices | Office |  |  | 1 | 1 |  |

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