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Loans Receivable - Loans Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Loans individually evaluated for impairment by class loans
Loan Balance	$ 3,491
Recorded Investment	2,854
Partial Charge-off	618
Average Investment in Impaired Loans	4,164
Interest Income Recognized	80
Allowance for loan losses (With an allowance recorded)	27	$ 0
Impaired Loan, Total	3,847	6,007
Recorded Investment, Total	3,124	5,196
Partial Charge-offs, Total	711	806
Average Investment in Impaired Loans, Total	4,185	5,059
Interest Income Recognized, Total	80	238
One-to-four family residential real estate loans [Member]
Loans individually evaluated for impairment by class loans
Loan Balance	2,751	5,049
Recorded Investment	2,155	4,248
Partial Charge-off	575	806
Average Investment in Impaired Loans	3,274	4,212
Interest Income Recognized	41	197
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	654	958
Recorded Investment	653	948
Partial Charge-off	0	0
Average Investment in Impaired Loans	795	847
Interest Income Recognized	39	41
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 (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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