LOANS - Summary of allowance for loan losses and the recorded investment in loans by portfolio segments (Detail) - USD ($)	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Individually evaluated for impairment	$ 35,859		$ 35,859
Collectively evaluated for impairment	2,217,315		2,117,315
Total ending allowance balance	2,253,174	$ 2,153,174	2,153,174	$ 2,128,174	$ 2,182,174	$ 2,241,174
Loans individually evaluated for impairment	850,993		1,118,300
Loans collectively evaluated for impairment	627,496,225		565,678,716
Loans acquired with deteriorated credit quality	4,716,336		5,565,827
Total ending loan balance	633,063,554		572,362,843
Commercial Real Estate Portfolio Segment | Residential First Mortgage
Financing Receivable, Past Due [Line Items]
Individually evaluated for impairment	35,859		35,859
Collectively evaluated for impairment	1,216,065		1,056,615
Total ending allowance balance	1,251,924	1,092,474	1,092,474	1,126,694	1,185,674	1,254,174
Loans individually evaluated for impairment	832,754		1,099,793
Loans collectively evaluated for impairment	375,642,159		314,754,870
Loans acquired with deteriorated credit quality	3,301,740		4,113,571
Total ending loan balance	379,776,653		319,968,234
Commercial Real Estate Portfolio Segment | Commercial and Multi-Family Real Estate
Financing Receivable, Past Due [Line Items]
Collectively evaluated for impairment	680,000		768,600
Total ending allowance balance	680,000	768,600	768,600	853,000	849,000	841,000
Loans collectively evaluated for impairment	172,240,349		173,962,424
Loans acquired with deteriorated credit quality	1,379,344		1,412,995
Total ending loan balance	173,619,693		175,375,419
Commercial Real Estate Portfolio Segment | Construction
Financing Receivable, Past Due [Line Items]
Collectively evaluated for impairment	232,000		195,000
Total ending allowance balance	232,000	195,000	195,000	54,000	48,000	45,000
Loans collectively evaluated for impairment	51,799,501		41,384,687
Total ending loan balance	51,799,501		41,384,687
Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Collectively evaluated for impairment	7,000		9,400
Total ending allowance balance	7,000	9,400	9,400	8,480	13,500	14,000
Loans collectively evaluated for impairment	2,068,871		7,866,263
Loans acquired with deteriorated credit quality			39,261
Total ending loan balance	2,068,871		7,905,524
Consumer | Home Equity and Other
Financing Receivable, Past Due [Line Items]
Collectively evaluated for impairment	82,250		87,700
Total ending allowance balance	82,250	$ 87,700	87,700	$ 86,000	$ 86,000	$ 87,000
Loans individually evaluated for impairment	18,239		18,507
Loans collectively evaluated for impairment	25,745,345		27,710,472
Loans acquired with deteriorated credit quality	35,252		39,261
Total ending loan balance	$ 25,798,836		$ 27,728,979