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Investment Securities - Narrative (Details) $ in Millions | Dec. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
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Marketable Securities [Abstract] |  |
Number of securities in an unrealized loss position, less than twelve months | 14 | 23
Number of securities in an unrealized loss position, greater than one year | 23 | 17
Pledged securities | $ | $ 58.4 | $ 51.6

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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References No definition available. + Details
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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months. + 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 other comprehensive income (available-for-sale). + 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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