Loans Receivable Held for Investment - Aging of Recorded Investment in Past Due Loans by Loan Type (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Past due receivable
Total Past Due	$ 1,670	$ 1,388
Current	352,884	382,669
30-59 Days Past Due
Past due receivable
Total Past Due	371	1,324
60-89 Days Past Due
Past due receivable
Total Past Due	57	64
Greater than 90 Days Past Due
Past due receivable
Total Past Due	1,242
Single family
Past due receivable
Total Past Due	57	64
Current	96,261	105,268
Single family | 60-89 Days Past Due
Past due receivable
Total Past Due	57	64
Multi-family
Past due receivable
Current	216,420	231,440
Commercial real estate
Past due receivable
Total Past Due		1,324
Current	6,410	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	1,613
Current	32,498	37,223
Church | 30-59 Days Past Due
Past due receivable
Total Past Due	371
Church | Greater than 90 Days Past Due
Past due receivable
Total Past Due	1,242
Construction
Past due receivable
Current	947	827
Commercial - other
Past due receivable
Current	344	308
Consumer
Past due receivable
Current	$ 4	$ 6