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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 | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Gain (Loss) on Securities [Line Items] |  |  |  |
Debt securities, Gross Realized Gains | $ 7,938 |  | $ 11,207 |
Debt securities, Gross Realized Losses | 3,446 |  | 6,474 |
Debt securities, Net Gains (Losses) | 4,492 |  | 4,733 |
Debt and Equity securities, Gross Realized Gains | 7,938 |  | 11,207 |
Debt and Equity securities, Gross Realized Losses | 3,446 |  | 6,474 |
Debt and Equity securities, Net Gains (Losses) | $ 4,492 |  | $ 4,733 |
Gross Realized Gains |  | $ 116 |  | $ 1,665
Gross Realized Losses |  | (102) |  | (1,628)
Net Gains |  | 14 |  | 37
Equity Securities [Member] |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross Realized Gains |  |  |  | 9
Gross Realized Losses |  |  |  | 0
Net Gains |  |  |  | 9
Debt Securities [Member] |  |  |  |
Gain (Loss) on Securities [Line Items] |  |  |  |
Gross Realized Gains |  | 116 |  | 1,656
Gross Realized Losses |  | (102) |  | (1,628)
Net Gains |  | $ 14 |  | $ 28

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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments 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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