Loans Receivable Held for Investment - Risk category of loans by loan type (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Credit Quality Indicators
Loans receivable	$ 349,330	$ 308,999
Single family
Credit Quality Indicators
Loans receivable	110,557	131,595
Multi-family
Credit Quality Indicators
Loans receivable	191,337	119,626
Commercial real estate
Credit Quality Indicators
Loans receivable	8,972	11,412
Church
Credit Quality Indicators
Loans receivable	37,838	45,749
Construction
Credit Quality Indicators
Loans receivable	308	343
Commercial - other
Credit Quality Indicators
Loans receivable	309	270
Consumer
Credit Quality Indicators
Loans receivable	9	4
Pass
Credit Quality Indicators
Loans receivable	336,151	289,410
Pass | Single family
Credit Quality Indicators
Loans receivable	110,429	128,736
Pass | Multi-family
Credit Quality Indicators
Loans receivable	189,681	117,602
Pass | Commercial real estate
Credit Quality Indicators
Loans receivable	7,011	7,509
Pass | Church
Credit Quality Indicators
Loans receivable	28,470	35,013
Pass | Construction
Credit Quality Indicators
Loans receivable	308	343
Pass | Commercial - other
Credit Quality Indicators
Loans receivable	243	203
Pass | Consumer
Credit Quality Indicators
Loans receivable	9	4
Watch
Credit Quality Indicators
Loans receivable	717	776
Watch | Church
Credit Quality Indicators
Loans receivable	717	776
Special Mention
Credit Quality Indicators
Loans receivable	1,300	4,340
Special Mention | Single family
Credit Quality Indicators
Loans receivable	128	2,557
Special Mention | Multi-family
Credit Quality Indicators
Loans receivable	345	352
Special Mention | Church
Credit Quality Indicators
Loans receivable	827	1,431
Substandard
Credit Quality Indicators
Loans receivable	11,162	14,473
Substandard | Single family
Credit Quality Indicators
Loans receivable		302
Substandard | Multi-family
Credit Quality Indicators
Loans receivable	1,311	1,672
Substandard | Commercial real estate
Credit Quality Indicators
Loans receivable	1,961	3,903
Substandard | Church
Credit Quality Indicators
Loans receivable	7,824	8,529
Substandard | Commercial - other
Credit Quality Indicators
Loans receivable	$ 66	$ 67