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 ($)	Jun. 30, 2023	Mar. 31, 2023	Jan. 01, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Past Due [Line Items]
Allowance for credit losses	$ 2,785,949	$ 2,860,949	$ 2,860,949	$ 2,578,174	$ 2,253,174	$ 2,153,174	$ 2,153,174
Total			3,012,949
Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses				3,960
Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses	11,400	4,000	(4,000)	3,960	7,000	9,400	9,400
Consumer
Financing Receivable, Past Due [Line Items]
Allowance for credit losses	11,400
Residential First Mortgage | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses	1,811,547	1,914,947	1,814,203	1,602,534	1,251,924	1,092,474	1,092,474
Commercial and Multi-Family Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses	539,002			615,480	680,000	768,600	768,600
Commercial Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses	539,002	423,002	522,977	381,180
Multi-Family Real Estate | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses	265,000	278,000	259,769	234,300
Construction | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses	159,000	$ 241,000	260,000	258,500	232,000	195,000	195,000
Construction | Commercial Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses	$ 159,000
Home Equity and Other | Commercial Real Estate Portfolio Segment
Financing Receivable, Past Due [Line Items]
Allowance for credit losses				97,700
Home Equity and Other | Consumer
Financing Receivable, Past Due [Line Items]
Allowance for credit losses				97,700	$ 82,250	$ 87,700	$ 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	2,860,949
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