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Investment Securities - Additional Information (Detail) | 9 Months Ended |
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Sep. 30, 2017 USD ($) Securities | Dec. 31, 2016 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |
Number of securities with unrealized loss | Securities | 65 |
Percentage of gross unrealized loss | 1.10% |
Percentage of amortized investment securities portfolio | 0.60% |
Number of securities in continuous loss position | Securities | 18 |
Loss duration | 12 months |
Unrealized loss on debt securities | $ 441,000 |
Amortized cost on debt securities in continuous loss | 22,900,000 |
Securities pledged to secure public deposits | $ 102,401,000 | $ 91,773,000

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- Definition The fair value of available-for-sale 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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