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Summary of Significant Accounting Policies - Investment in Affordable Housing Limited Partnership (Details) | 12 Months Ended
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Dec. 31, 2017
Affordable Housing Limited Partnership | Maximum |
Investment in Affordable Housing Limited Partnership |
Ownership interest (as a percent) | 5.00%

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- Definition Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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- Details
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