LOANS - Summary of allowance for loan losses and the recorded investment in loans by portfolio segments (Detail) - USD ($)	Mar. 31, 2022	Dec. 31, 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	2,117,315	2,117,315
Total ending allowance balance	2,153,174	2,153,174	$ 2,182,174	$ 2,241,174
Loans individually evaluated for impairment	879,014	1,118,300
Loans collectively evaluated for impairment	560,558,853	565,678,716
Loans acquired with deteriorated credit quality	5,142,148	5,565,827
Total ending loan balance	566,580,015	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	1,039,215	1,056,615
Total ending allowance balance	1,075,074	1,092,474	1,185,674	1,254,174
Loans individually evaluated for impairment	839,620	1,099,793
Loans collectively evaluated for impairment	312,109,117	314,754,870
Loans acquired with deteriorated credit quality	3,708,833	4,113,571
Total ending loan balance	316,657,570	319,968,234
Commercial Real Estate Portfolio Segment | Commercial and Multi-Family Real Estate
Financing Receivable, Past Due [Line Items]
Collectively evaluated for impairment	780,000	768,600
Total ending allowance balance	780,000	768,600	849,000	841,000
Loans collectively evaluated for impairment	175,829,775	173,962,424
Loans acquired with deteriorated credit quality	1,396,055	1,412,995
Total ending loan balance	177,225,830	175,375,419
Commercial Real Estate Portfolio Segment | Construction
Financing Receivable, Past Due [Line Items]
Collectively evaluated for impairment	208,000	195,000
Total ending allowance balance	208,000	195,000	48,000	45,000
Loans collectively evaluated for impairment	43,639,387	41,384,687
Total ending loan balance	43,639,387	41,384,687
Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Collectively evaluated for impairment	9,300	9,400
Total ending allowance balance	9,300	9,400	13,000	14,000
Loans collectively evaluated for impairment	3,494,447	7,866,263
Loans acquired with deteriorated credit quality		39,261
Total ending loan balance	3,494,447	7,905,524
Consumer | Home Equity and Other
Financing Receivable, Past Due [Line Items]
Collectively evaluated for impairment	80,800	87,700
Total ending allowance balance	80,800	87,700	$ 86,500	$ 87,000
Loans individually evaluated for impairment	39,394	18,507
Loans collectively evaluated for impairment	25,486,127	27,710,472
Loans acquired with deteriorated credit quality	37,260	39,261
Total ending loan balance	$ 25,562,781	$ 27,728,979