Loans Receivable Held for Investment - Risk Category of Loans by Loan Type (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Credit Quality Indicators
Loans receivable	$ 354,554	$ 384,057
Single family
Credit Quality Indicators
Loans receivable	96,318	105,332
Multi-family
Credit Quality Indicators
Loans receivable	216,420	231,440
Commercial real estate
Credit Quality Indicators
Loans receivable	6,410	8,921
Church
Credit Quality Indicators
Loans receivable	34,111	37,223
Construction
Credit Quality Indicators
Loans receivable	947	827
Commercial - other
Credit Quality Indicators
Loans receivable	344	308
Consumer
Credit Quality Indicators
Loans receivable	4	6
Pass
Credit Quality Indicators
Loans receivable	345,971	369,454
Pass | Single family
Credit Quality Indicators
Loans receivable	96,318	105,332
Pass | Multi-family
Credit Quality Indicators
Loans receivable	215,138	228,522
Pass | Commercial real estate
Credit Quality Indicators
Loans receivable	6,287	6,965
Pass | Church
Credit Quality Indicators
Loans receivable	26,998	27,560
Pass | Construction
Credit Quality Indicators
Loans receivable	947	827
Pass | Commercial - other
Credit Quality Indicators
Loans receivable	279	242
Pass | Consumer
Credit Quality Indicators
Loans receivable	4	6
Watch
Credit Quality Indicators
Loans receivable	569	2,417
Watch | Multi-family
Credit Quality Indicators
Loans receivable		1,274
Watch | Commercial real estate
Credit Quality Indicators
Loans receivable	123
Watch | Church
Credit Quality Indicators
Loans receivable	446	1,143
Special Mention
Credit Quality Indicators
Loans receivable	269	1,165
Special Mention | Multi-family
Credit Quality Indicators
Loans receivable		342
Special Mention | Church
Credit Quality Indicators
Loans receivable	269	823
Substandard
Credit Quality Indicators
Loans receivable	7,745	11,021
Substandard | Multi-family
Credit Quality Indicators
Loans receivable	1,282	1,302
Substandard | Commercial real estate
Credit Quality Indicators
Loans receivable		1,956
Substandard | Church
Credit Quality Indicators
Loans receivable	6,398	7,697
Substandard | Commercial - other
Credit Quality Indicators
Loans receivable	$ 65	$ 66