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Investment Securities Summary of Gains and Losses from Equity and Debt Securities, and Losses from Other-than-Temporary Impairment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Equity Securities, FV-NI, Realized Gain | $ 9 | $ 13,558 | $ 2,005
Debt and Equity Securities, Realized Gain (Loss) | 37 | 9,071 | 2,550
Debt Securities, Available-for-sale, Realized Gain (Loss) | 28 | (4,487) | 555
Debt And Equity Securities, Realized Gain | 1,665 | 13,873 | 2,586
Equity Securities, FV-NI, Realized Gain (Loss) | 9 | 13,558 | 1,995
Debt Securities, Available-for-sale, Realized Gain | 1,656 | 315 | 581
Equity Securities, FV-NI, Realized Loss | 0 | 0 | 10
Debt Securities, Available-for-sale, Realized Loss | 1,628 | 4,802 | 26
Debt And Equity Securities, Realized Loss | $ 1,628 | $ 4,802 | $ 36

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- Definition Amount of realized gain (loss) on investment in debt and equity securities. + References No definition available. + Details
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- Definition Amount of realized gain on 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 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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- Definition Amount of realized gain (loss) on 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/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 + Details
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