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Investments in Qualified Affordable Housing Projects Investments in Qualified Affordable Housing Projects - Narrative (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
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Equity Method Investments and Joint Ventures [Abstract] |  |
Carrying value of qualified affordable housing project investments | $ 7,232,000 | $ 7,637,000
Funding obligation related to qualified affordable housing projects | $ 0 |

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- Definition Amount of investment in qualified affordable housing projects. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64813897&loc=SL49122993-202985 + Details
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- Definition Amount of commitment or contingent commitments to qualified affordable housing project investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=64813897&loc=SL49122993-202985 + Details
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