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Investment Securities and Equity Securities with Readily Determinable Fair Values (Unrealized and realized gains and losses recognized in net income on equity securities ) (Details) - USD ($) $ in Thousands | 3 Months Ended |
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Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Investment Securities |  |  |
Equity Securities | $ 6,075 |  | $ 5,937
Summary of unrealized and realized gains and losses recognized in net income on equity securities |  |  |
Net losses recognized during the period on equity securities | 138 | $ (774) |
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date | $ 138 | $ (774) |

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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 Amount of unrealized gain (loss) on 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84241550&loc=SL75117546-209714 + Details
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