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Qualified Affordable Housing Project Investments - Additional Information (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Schedule Of Equity Method Investments [Line Items] |  |  |
Investment for qualified affordable housing projects | $ 5,768,000 |  | $ 986,000
Unfunded commitments related to the investments in qualified housing projects | 4,572,000 |  | $ 840,000
Amortization expense | $ 218,000 | $ 10,000 |
Maximum |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Expected year in which commitments are fulfilled | 2027 |  |
Minimum |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Expected year in which commitments are fulfilled | 2028 |  |

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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 amortization expense 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 (c) -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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