Loans Receivable and the Allowance for Loan Losses - Aged analysis (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 78,484,000	$ 80,688,000
Loans over 90 days past due and still accruing	0	0
Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	78,484,000	80,688,000
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	77,830,000	80,017,000
Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	87,000	91,000
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	567,000	580,000
Mortgage - 1-4 Family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	73,591,000	75,185,000
Mortgage - 1-4 Family \| Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	73,591,000	75,185,000
Mortgage - 1-4 Family \| Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	72,937,000	74,514,000
Mortgage - 1-4 Family \| Watch
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	87,000	91,000
Mortgage - 1-4 Family \| Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	567,000	580,000
Mortgage - Multifamily
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,567,000	4,117,000
Mortgage - Multifamily \| Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,567,000	4,117,000
Mortgage - Multifamily \| Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,567,000	4,117,000
Mortgage - Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,117,000	1,175,000
Mortgage - Commercial real estate \| Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,117,000	1,175,000
Mortgage - Commercial real estate \| Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,117,000	1,175,000
Consumer Loans
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	209,000	211,000
Consumer Loans \| Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	209,000	211,000
Consumer Loans \| Pass
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 209,000	$ 211,000

Recorded investment in financing receivables that are 90 days or more past due and still accruing.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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