Proposed Business Combination - Additional Information (Detail)			3 Months Ended	6 Months Ended	12 Months Ended
	May 04, 2021 $ / shares shares	May 03, 2021 USD ($) $ / shares	Jun. 30, 2021 USD ($) Office shares	Jun. 30, 2021 USD ($) 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			$ 977,500	$ 977,500	$ 42,500
Consulting Fees [Member]
Business Acquisition [Line Items]
Business combination, acquisition related costs			245,000.0	245,000.0	12,500
Other General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Business combination, acquisition related costs			179,800	$ 179,800	$ 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	1,776,000
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	1,833,000
Business combination, acquisition related costs			248,100	$ 248,100
Perpetual Federal Savings Bank {Member] | Consulting Fees [Member]
Business Acquisition [Line Items]
Business combination, acquisition related costs			91,800	91,800
Perpetual Federal Savings Bank {Member] | Other General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Business combination, acquisition related costs			$ 156,300	$ 156,300
Perpetual Federal Savings Bank {Member] | Urbana Ohio [Member]
Business Acquisition [Line Items]
Number of full-service offices | Office			1	1