LOANS - Summary of aging of loans receivable by portfolio segment (Detail) - USD ($)	Mar. 31, 2023	Jan. 01, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
PCI Loans			$ 4,220,697
Total loans	$ 714,751,296	$ 721,729,711	721,603,936
Commercial and Industrial
Financing Receivable, Past Due [Line Items]
Total loans	1,523,380		1,684,189
Residential First Mortgage | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
PCI Loans			2,841,097
Total loans	489,079,665	495,689,840	466,100,627
Commercial Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total loans	95,343,455	96,030,721
Multi-Family Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total loans	71,414,226	66,400,713
Commercial and Multi-Family Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
PCI Loans			1,348,483
Total loans			162,338,669
Construction | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total loans	57,379,095	61,825,478	61,825,478
Consumer | Consumer
Financing Receivable, Past Due [Line Items]
Total loans	11,475	$ 98,770
Home Equity and Other Consumer | Consumer
Financing Receivable, Past Due [Line Items]
PCI Loans			31,117
Total loans			29,654,973
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans Due			92,977
30-59 Days Past Due | Home Equity and Other Consumer | Consumer
Financing Receivable, Past Due [Line Items]
Loans Due			92,977
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans Due	1,117,150		360,849
60-89 Days Past Due | Residential First Mortgage | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Loans Due	1,117,150		360,849
Greater than 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans Due	12,132,382		298,637
Greater than 89 Days Past Due | Residential First Mortgage | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Loans Due	783,376		279,515
Greater than 89 Days Past Due | Commercial Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Loans Due	455,293
Greater than 89 Days Past Due | Construction | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Loans Due	10,893,713
Greater than 89 Days Past Due | Home Equity and Other Consumer | Consumer
Financing Receivable, Past Due [Line Items]
Loans Due			19,122
Past Due
Financing Receivable, Past Due [Line Items]
Loans Due	13,249,532		752,463
Past Due | Residential First Mortgage | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Loans Due	1,900,526		640,364
Past Due | Commercial Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Loans Due	455,293
Past Due | Construction | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Loans Due	10,893,713
Past Due | Home Equity and Other Consumer | Consumer
Financing Receivable, Past Due [Line Items]
Loans Due			112,099
Not Past Due
Financing Receivable, Past Due [Line Items]
Loans Due	701,501,764		716,630,776
Not Past Due | Commercial and Industrial
Financing Receivable, Past Due [Line Items]
Loans Due	1,523,380		1,684,189
Not Past Due | Residential First Mortgage | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Loans Due	487,179,139		462,619,166
Not Past Due | Commercial Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Loans Due	94,888,162
Not Past Due | Multi-Family Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Loans Due	71,414,226
Not Past Due | Commercial and Multi-Family Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Loans Due			160,990,186
Not Past Due | Construction | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Loans Due	46,485,382		61,825,478
Not Past Due | Consumer | Consumer
Financing Receivable, Past Due [Line Items]
Loans Due	$ 11,475
Not Past Due | Home Equity and Other Consumer | Consumer
Financing Receivable, Past Due [Line Items]
Loans Due			$ 29,511,757