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Securities - Additional Information (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) securities | Sep. 30, 2018 USD ($) securities | Dec. 31, 2017 USD ($)
Schedule Of Equity Securities [Line Items] |  |  |
Sale of equity securities | $ 0 | $ 0 |
Equity securities, Fair Value | 4,981,000 | 4,981,000 | $ 5,006,000
Pledged debt securities, at carrying value | $ 107,249,000 | $ 107,249,000 | 85,985,000
Number of securities which is in unrealized loss position | securities | 516 | 516 |
Mutual Fund |  |  |
Schedule Of Equity Securities [Line Items] |  |  |
Equity securities, Fair Value | $ 4,981,000 | $ 4,981,000 | $ 5,006,000
Equity securities, Gross Unrealized Losses | $ 44,000 | $ 25,000 |

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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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