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Securities - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2018 | Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Shareholders' equity percentage (greater than) |  |  | 10.00% | 10.00%
Securities pledged to secure public deposits |  |  | $ 311,336 | $ 319,575
Tax provision related to net realized gains | $ 2 | $ 540 |  |

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- Definition Shareholders equity percentage. + References No definition available. + Details
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- Definition Tax provision related to net realized gains. + References No definition available. + Details
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- Definition Amount of restricted investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- References No definition available. + Details
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