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INVESTMENT SECURITIES - Proceeds from Sales of AFS Securities and Gross Gains and Gross Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Proceeds from sale of investment securities | $ 0 | $ 25,575 | $ 0 | $ 199,411 |
Gross gains | 0 | 2,328 | 0 | 4,956 |
Gross losses | 13 | 0 | 44 | 225 |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Gain on investments |  | $ 2,300 |  | $ 4,700 |
Collateral Pledged |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
AFS securities pledged to secure public funds, fair value | $ 426,100 |  | $ 426,100 |  | $ 158,700

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- Definition Amount of realized 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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