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SECURITIES AVAILABLE FOR SALE - Proceeds from Sales of AFS Securities and Gross Gains and Gross Losses (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |  |
Proceeds from sales of AFS securities |  | $ 114,871 | $ 25,533 | $ 174,335 | $ 88,110 |
Gross gains |  | 2,109 | 211 | 2,628 | 1,052 |
Gross losses |  | 45 | 165 | 225 | 190 |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Proceeds from sales of AFS securities |  | 114,871 | $ 25,533 | 174,335 | $ 88,110 |
Collateral Pledged |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
AFS securities pledged to secure public funds, fair value |  | $ 176,270 |  | $ 176,270 |  | $ 164,233
Subsequent Event |  |  |  |  |  |
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |  |
Proceeds from sales of AFS securities | $ 18,000 |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Proceeds from sales of AFS securities | 18,000 |  |  |  |  |
Net Gain on AFS securities | $ 2,300 |  |  |  |  |

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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=118939692&loc=d3e27357-111563 + Details
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