LOANS - Summary of loans receivable by credit quality risk (Detail) - USD ($)	Mar. 31, 2023	Jan. 01, 2023	Dec. 31, 2022
Financing Receivable, Past Due [Line Items]
2023	$ 1,356,565
2022	121,852,766
2021	40,535,430
2020	38,673,157
2019	34,536,046
Prior	145,079,214
Revolving	332,718,118
Total	714,751,296	$ 721,729,711	$ 721,603,936
Commercial and Industrial
Financing Receivable, Past Due [Line Items]
2021	259,355
2020	767,024
2019	348,985
Prior	6,494
Revolving	141,522
Total	1,523,380		1,684,189
Pass
Financing Receivable, Past Due [Line Items]
Total			720,555,735
Pass | Commercial and Industrial
Financing Receivable, Past Due [Line Items]
2021	259,355
2020	767,024
2019	348,985
Prior	6,494
Revolving	141,522
Total	1,523,380		1,684,189
Special Mention
Financing Receivable, Past Due [Line Items]
Total			575,087
Substandard
Financing Receivable, Past Due [Line Items]
Total			473,114
Residential First Mortgage | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
2023	1,356,565
2022	116,300,705
2021	40,276,075
2020	30,069,341
2019	28,581,296
Prior	130,169,012
Revolving	142,326,671
Total	489,079,665	495,689,840	466,100,627
Residential First Mortgage | Pass | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
2023	1,356,565
2022	116,300,705
2021	40,276,075
2020	29,878,332
2019	28,409,680
Prior	129,243,964
Revolving	141,925,437
Total	487,390,758		465,089,495
Residential First Mortgage | Special Mention | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
2020	191,009
2019	171,616
Prior	455,299
Revolving	112,099
Total	930,023		555,965
Residential First Mortgage | Substandard | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Prior	469,749
Revolving	289,135
Total	758,884		455,167
Commercial Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
2022	3,116,904
2020	6,634,424
2019	5,605,765
Prior	12,726,031
Revolving	67,260,331
Total	95,343,455	96,030,721
Commercial Real Estate | Pass | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
2022	3,116,904
2020	6,634,424
2019	5,605,765
Prior	12,726,031
Revolving	66,772,576
Total	94,855,700
Commercial Real Estate | Special Mention | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Revolving	487,755
Total	487,755
Multi-Family Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
2022	2,435,157
2020	1,202,368
Prior	2,177,677
Revolving	65,599,024
Total	71,414,226	66,400,713
Multi-Family Real Estate | Pass | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
2022	2,435,157
2020	1,202,368
Prior	2,177,677
Revolving	65,599,024
Total	71,414,226
Construction | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Revolving	57,379,095
Total	57,379,095	61,825,478	61,825,478
Construction | Pass | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Revolving	46,456,575
Total	46,456,575		61,825,478
Construction | Substandard | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Revolving	10,922,520
Total	10,922,520
Consumer | Consumer
Financing Receivable, Past Due [Line Items]
Revolving	11,475
Total	11,475	$ 98,770
Consumer | Pass | Consumer
Financing Receivable, Past Due [Line Items]
Revolving	11,475
Total	$ 11,475
Commercial and Multi-Family Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total			162,338,669
Commercial and Multi-Family Real Estate | Pass | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Total			162,338,669
Home Equity and Other Consumer
Financing Receivable, Past Due [Line Items]
Total			29,654,973
Home Equity and Other Consumer | Pass
Financing Receivable, Past Due [Line Items]
Total			29,617,904
Home Equity and Other Consumer | Special Mention
Financing Receivable, Past Due [Line Items]
Total			19,122
Home Equity and Other Consumer | Substandard
Financing Receivable, Past Due [Line Items]
Total			$ 17,947