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Qualified Affordable Housing Project Investments - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Investments In Affordable Housing Projects [Abstract] |  |  |  |  |
Investment for qualified affordable housing projects included in other assets | $ 4,197,000 |  | $ 4,197,000 |  | $ 3,204,000
Unfunded commitments related to the investments in qualified affordable housing projects | 3,129,000 |  | 3,129,000 |  | $ 4,510,000
Recognized amortization expense | 130,000 | $ 82,000 | 388,000 | $ 247,000 |
Recognized tax credits and other benefits from its investment in affordable housing tax credits | 207,000 | 138,000 | 633,000 | 414,000 |
Impairment losses related to its investment in qualified affordable housing projects | $ 0 | $ 0 | $ 0 | $ 0 |

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- Definition Amount of write-down from impairment of an investment in a qualified affordable housing project. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=114775393&loc=SL49122993-202985 + Details
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- Definition Amount of affordable housing tax credits and other tax benefits recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114775393&loc=SL49122993-202985 + Details
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- Definition Amount of investment in qualified affordable housing projects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=114775393&loc=SL49122993-202985 + Details
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- Definition Amount of amortization expense of investment in qualified affordable housing projects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=114775393&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=114775393&loc=SL49122993-202985 + Details
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