Loans Receivable Held for Investment - Risk Category of Loans by Loan Type (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Credit Quality Indicators
Loans receivable	$ 366,130	$ 384,057
Single family
Credit Quality Indicators
Loans receivable	99,179	105,332
Multi-family
Credit Quality Indicators
Loans receivable	222,378	231,440
Commercial real estate
Credit Quality Indicators
Loans receivable	7,772	8,921
Church
Credit Quality Indicators
Loans receivable	35,624	37,223
Construction
Credit Quality Indicators
Loans receivable	855	827
Commercial - other
Credit Quality Indicators
Loans receivable	307	308
Consumer
Credit Quality Indicators
Loans receivable	15	6
Pass
Credit Quality Indicators
Loans receivable	354,133	369,454
Pass | Single family
Credit Quality Indicators
Loans receivable	99,179	105,332
Pass | Multi-family
Credit Quality Indicators
Loans receivable	220,746	228,522
Pass | Commercial real estate
Credit Quality Indicators
Loans receivable	6,449	6,965
Pass | Church
Credit Quality Indicators
Loans receivable	26,648	27,560
Pass | Construction
Credit Quality Indicators
Loans receivable	855	827
Pass | Commercial - other
Credit Quality Indicators
Loans receivable	241	242
Pass | Consumer
Credit Quality Indicators
Loans receivable	15	6
Watch
Credit Quality Indicators
Loans receivable	1,137	2,417
Watch | Multi-family
Credit Quality Indicators
Loans receivable		1,274
Watch | Church
Credit Quality Indicators
Loans receivable	1,137	1,143
Special Mention
Credit Quality Indicators
Loans receivable	611	1,165
Special Mention | Multi-family
Credit Quality Indicators
Loans receivable	340	342
Special Mention | Church
Credit Quality Indicators
Loans receivable	271	823
Substandard
Credit Quality Indicators
Loans receivable	10,249	11,021
Substandard | Multi-family
Credit Quality Indicators
Loans receivable	1,292	1,302
Substandard | Commercial real estate
Credit Quality Indicators
Loans receivable	1,323	1,956
Substandard | Church
Credit Quality Indicators
Loans receivable	7,568	7,697
Substandard | Commercial - other
Credit Quality Indicators
Loans receivable	$ 66	$ 66