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Loans Receivable - Loans Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Loans individually evaluated for impairment by class loans
Loan Balance		$ 3,491
Recorded Investment		2,871
Partial Charge-off		618
Average Investment in Impaired Loans		4,164
Interest Income Recognized		80
Loan Balance (With an allowance recorded)		3,847
Recorded Investment (With an allowance recorded)		3,141
Partial Charge-offs (With an allowance recorded)		711
Allowance for loan losses (With an allowance recorded)	$ 0	27
Average Investment in Impaired Loans (With an allowance recorded)		4,185
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		80
Impaired Loan, Total	3,068
Recorded Investment, Total	2,743
Partial Charge-offs, Total	339
Average Investment in Impaired Loans, Total	3,434
Interest Income Recognized, Total	90
One-to-four family residential real estate loans [Member]
Loans individually evaluated for impairment by class loans
Loan Balance	2,168	2,751
Recorded Investment	1,835	2,172
Partial Charge-off	339	575
Average Investment in Impaired Loans	2,208	3,274
Interest Income Recognized	51	41
Allowance for loan losses (With an allowance recorded)	0	0
One-to-four family residential real estate loans - non-owner occupied loans [Member]
Loans individually evaluated for impairment by class loans
Loan Balance		86
Recorded Investment		46
Partial Charge-off		43
Average Investment in Impaired Loans		95
Interest Income Recognized		0
Multi-family mortgage loans [Member]
Loans individually evaluated for impairment by class loans
Loan Balance	620	654
Recorded Investment	620	653
Partial Charge-off	0	0
Average Investment in Impaired Loans	637	795
Interest Income Recognized	37	39
Allowance for loan losses (With an allowance recorded)	0	0
Nonresidential real estate loans [Member]
Loans individually evaluated for impairment by class loans
Loan Balance	280
Recorded Investment	288
Partial Charge-off	0
Average Investment in Impaired Loans	589
Interest Income Recognized	2
Loan Balance (With an allowance recorded)		356
Recorded Investment (With an allowance recorded)		270
Partial Charge-offs (With an allowance recorded)		93
Allowance for loan losses (With an allowance recorded)		27
Average Investment in Impaired Loans (With an allowance recorded)		21
Impaired Financing Receivable, with Related Allowance, Interest Income, Cash Basis Method		0
Consumer loans [Member]
Loans individually evaluated for impairment by class loans
Allowance for loan losses (With an allowance recorded)	$ 0	$ 0

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