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LOANS - Impaired Loans (prior to the adoption of Topic 326) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Financing Receivable, Impaired [Line Items] |  |  |  |
Individually impaired loans | $ 22,501 |  | $ 16,084 | $ 27,000
Impaired loans | $ 16,143 | $ 1,057 | $ 20,286 |
Other Impaired Performing Loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired loans |  |  |  | $ 1,100

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- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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