SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Effect of Adoption of ASC 326 on Allowance for Credit Losses Including Unfunded Commitments by Portfolio Segment (Detail) - USD ($)	Mar. 31, 2023	Jan. 01, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Allowance for credit losses	$ 2,860,949	$ 2,860,949	$ 2,578,174	$ 2,153,174	$ 2,153,174
Total		3,012,949
Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses	4,000	4,000	3,960	9,300	9,400
Residential First Mortgage | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses	1,914,947	1,814,203	1,602,534	1,075,074	1,092,474
Commercial and Multi-Family Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses			615,480	780,000	768,600
Commercial Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses	423,000	522,977	381,180
Multi-Family Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses	278,000	259,769	234,300
Construction | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses	$ 195,240	260,000	258,500	208,000	195,000
Home Equity and Other | Consumer
Financing Receivable, Past Due [Line Items]
Allowance for credit losses			97,700	$ 80,800	$ 87,700
Unfunded Commitments
Financing Receivable, Past Due [Line Items]
Allowance for credit losses		152,000
Pre Adoption
Financing Receivable, Past Due [Line Items]
Allowance for credit losses		2,578,174	2,578,174
Total		2,578,174
Pre Adoption | Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses		3,960
Pre Adoption | Residential First Mortgage | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses		1,602,534
Pre Adoption | Commercial and Multi-Family Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses		615,480
Pre Adoption | Construction | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses		258,500
Pre Adoption | Home Equity and Other | Consumer
Financing Receivable, Past Due [Line Items]
Allowance for credit losses		97,700
The Effect of Adoption
Financing Receivable, Past Due [Line Items]
Allowance for credit losses		282,775	$ 282,775
Total		434,775
The Effect of Adoption | Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses		40
The Effect of Adoption | Residential First Mortgage | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses		211,669
The Effect of Adoption | Commercial and Multi-Family Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses		(615,480)
The Effect of Adoption | Commercial Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses		522,977
The Effect of Adoption | Multi-Family Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses		259,769
The Effect of Adoption | Construction | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses		1,500
The Effect of Adoption | Home Equity and Other | Consumer
Financing Receivable, Past Due [Line Items]
Allowance for credit losses		(97,700)
The Effect of Adoption | Unfunded Commitments
Financing Receivable, Past Due [Line Items]
Allowance for credit losses		$ 152,000