Loans Receivable Held for Investment, Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	$ 365,735	$ 363,344
Pass [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	360,487	358,037
Watch [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	2,132	2,145
Special Mention [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Substandard [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	3,116	3,162
Doubtful [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Loss [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Single Family [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	44,537	48,357
Real Estate [Member] | Single Family [Member] | Pass [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	44,536	48,357
Real Estate [Member] | Single Family [Member] | Watch [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Single Family [Member] | Special Mention [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Single Family [Member] | Substandard [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	1
Real Estate [Member] | Single Family [Member] | Doubtful [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Single Family [Member] | Loss [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Multi-Family [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	281,046	273,864
Real Estate [Member] | Multi-Family [Member] | Pass [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	280,689	273,501
Real Estate [Member] | Multi-Family [Member] | Watch [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Multi-Family [Member] | Special Mention [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Multi-Family [Member] | Substandard [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	358	362
Real Estate [Member] | Multi-Family [Member] | Doubtful [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Multi-Family [Member] | Loss [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Commercial Real Estate [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	24,164	24,322
Real Estate [Member] | Commercial Real Estate [Member] | Pass [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	22,684	22,834
Real Estate [Member] | Commercial Real Estate [Member] | Watch [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	1,480	1,488
Real Estate [Member] | Commercial Real Estate [Member] | Special Mention [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Commercial Real Estate [Member] | Substandard [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Commercial Real Estate [Member] | Doubtful [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Commercial Real Estate [Member] | Loss [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Church [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	15,458	16,308
Real Estate [Member] | Church [Member] | Pass [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	12,093	12,899
Real Estate [Member] | Church [Member] | Watch [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	652	657
Real Estate [Member] | Church [Member] | Special Mention [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Church [Member] | Substandard [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	2,713	2,752
Real Estate [Member] | Church [Member] | Doubtful [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Church [Member] | Loss [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Construction [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	469	430
Real Estate [Member] | Construction [Member] | Pass [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	469	430
Real Estate [Member] | Construction [Member] | Watch [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Construction [Member] | Special Mention [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Construction [Member] | Substandard [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Construction [Member] | Doubtful [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Real Estate [Member] | Construction [Member] | Loss [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Commercial - Other [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	54	56
Commercial - Other [Member] | Pass [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	9	9
Commercial - Other [Member] | Watch [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Commercial - Other [Member] | Special Mention [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Commercial - Other [Member] | Substandard [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	45	47
Commercial - Other [Member] | Doubtful [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Commercial - Other [Member] | Loss [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Consumer [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	7	7
Consumer [Member] | Pass [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	7	7
Consumer [Member] | Watch [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Consumer [Member] | Special Mention [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Consumer [Member] | Substandard [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Consumer [Member] | Doubtful [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	0	0
Consumer [Member] | Loss [Member]
Risk Grade Category of Loans by Loan Type [Abstract]
Loans receivable	$ 0	$ 0