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Loans Receivable Held for Investment - Average of Loans Individually Evaluated for Impairment by Loan Type and Related Interest Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Impaired loans |  |
Average Recorded Investment | $ 10,958 | $ 13,669
Cash Basis Interest Income Recognized | 875 | 1,173
Foregone interest income if impaired loans had performed according to terms | 126 | 69
Single family |  |
Impaired loans |  |
Average Recorded Investment | 636 | 824
Cash Basis Interest Income Recognized | 28 | 253
Multi-family |  |
Impaired loans |  |
Average Recorded Investment | 589 | 916
Cash Basis Interest Income Recognized | 44 | 155
Commercial real estate |  |
Impaired loans |  |
Average Recorded Investment | 305 | 983
Cash Basis Interest Income Recognized | 104 | 271
Church |  |
Impaired loans |  |
Average Recorded Investment | 9,363 | 10,880
Cash Basis Interest Income Recognized | 693 | 489
Commercial - other |  |
Impaired loans |  |
Average Recorded Investment | 65 | 66
Cash Basis Interest Income Recognized | $ 6 | $ 5

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
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- Definition Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18794-111554 + Details
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