Loans Receivable Held for Investment - Aging of Recorded Investment in Past Due Loans by Loan Type (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Past due receivable
Total Past Due	$ 737	$ 1,388
Current	323,998	382,669
30-59 Days Past Due
Past due receivable
Total Past Due	17	1,324
60-89 Days Past Due
Past due receivable
Total Past Due	349	64
Greater than 90 Days Past Due
Past due receivable
Total Past Due	371
Single family
Past due receivable
Total Past Due	54	64
Current	89,925	105,268
Single family | 60-89 Days Past Due
Past due receivable
Total Past Due	54	64
Multi-family
Past due receivable
Total Past Due	295
Current	195,733	231,440
Multi-family | 60-89 Days Past Due
Past due receivable
Total Past Due	295
Commercial real estate
Past due receivable
Total Past Due		1,324
Current	6,136	7,597
Commercial real estate | 30-59 Days Past Due
Past due receivable
Total Past Due		1,324
Church
Past due receivable
Total Past Due	388
Current	30,465	37,223
Church | 30-59 Days Past Due
Past due receivable
Total Past Due	17
Church | Greater than 90 Days Past Due
Past due receivable
Total Past Due	371
Construction
Past due receivable
Current	1,381	827
Commercial - other
Past due receivable
Current	351	308
Consumer
Past due receivable
Current	$ 7	$ 6