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Fair Value - Additional Information (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
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Fair Value Disclosures [Abstract] |  |  |
Valuation allowance on real estate owned | $ 0 | $ 53,000 | $ 39,000
Valuation allowance on impaired financing receivable | $ 1,893,000 | $ 1,531,000 | $ 202,000

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- Definition The valuation allowance loss on real estate owned or any impairment losses taken against real estate investments held for use or resale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 43 -URI http://asc.fasb.org/extlink&oid=29634951&loc=d3e1739-110224 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=29634951&loc=d3e1424-110224 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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