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Securities - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) Securities | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) Securities | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) Securities
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Number of securities holdings | Securities | 0 |  | 0 |  | 0
Shareholders' equity percentage | 10.00% |  | 10.00% |  | 10.00%
Securities | $ 298,989 |  | $ 298,989 |  | $ 329,379
Tax provision related to net realized gains | $ 2 | $ 0 | $ 540 | $ 352 |

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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 The fair value of trading securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 + Details
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