Employee Stock Ownership Plan - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Employee Stock Ownership Plan E S O P Disclosures [Line Items]
Loan repaid term	25 years
Number of allocated shares	18,780
Annual allocation of shares, expiration year	2040
ESOP expense	$ 112,000	$ 94,000
Unallocated shares	352,187
Unallocated shares, value	$ 9,301,000
Common Stock [Member]
Employee Stock Ownership Plan E S O P Disclosures [Line Items]
Sale of stock, price per share	$ 10.00
The Randolph Savings Charitable Foundation, Inc. [Member]
Employee Stock Ownership Plan E S O P Disclosures [Line Items]
Sale of share in employee stock ownership plan	469,498