Loans Receivable Held for Investment - Risk Category of Loans by Loan Type (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Credit Quality Indicators
Loans receivable	$ 384,057	$ 308,999
Single family
Credit Quality Indicators
Loans receivable	105,332	131,595
Multi-family
Credit Quality Indicators
Loans receivable	231,440	119,626
Commercial real estate
Credit Quality Indicators
Loans receivable	8,921	11,412
Church
Credit Quality Indicators
Loans receivable	37,223	45,749
Construction
Credit Quality Indicators
Loans receivable	827	343
Commercial - other
Credit Quality Indicators
Loans receivable	308	270
Consumer
Credit Quality Indicators
Loans receivable	6	4
Pass
Credit Quality Indicators
Loans receivable	369,454	289,410
Pass | Single family
Credit Quality Indicators
Loans receivable	105,332	128,736
Pass | Multi-family
Credit Quality Indicators
Loans receivable	228,522	117,602
Pass | Commercial real estate
Credit Quality Indicators
Loans receivable	6,965	7,509
Pass | Church
Credit Quality Indicators
Loans receivable	27,560	35,013
Pass | Construction
Credit Quality Indicators
Loans receivable	827	343
Pass | Commercial - other
Credit Quality Indicators
Loans receivable	242	203
Pass | Consumer
Credit Quality Indicators
Loans receivable	6	4
Watch
Credit Quality Indicators
Loans receivable	2,417	776
Watch | Multi-family
Credit Quality Indicators
Loans receivable	1,274
Watch | Church
Credit Quality Indicators
Loans receivable	1,143	776
Special Mention
Credit Quality Indicators
Loans receivable	1,165	4,340
Special Mention | Single family
Credit Quality Indicators
Loans receivable		2,557
Special Mention | Multi-family
Credit Quality Indicators
Loans receivable	342	352
Special Mention | Church
Credit Quality Indicators
Loans receivable	823	1,431
Substandard
Credit Quality Indicators
Loans receivable	11,021	14,473
Substandard | Single family
Credit Quality Indicators
Loans receivable		302
Substandard | Multi-family
Credit Quality Indicators
Loans receivable	1,302	1,672
Substandard | Commercial real estate
Credit Quality Indicators
Loans receivable	1,956	3,903
Substandard | Church
Credit Quality Indicators
Loans receivable	7,697	8,529
Substandard | Commercial - other
Credit Quality Indicators
Loans receivable	$ 66	$ 67