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DERIVATIVE FINANCIAL INSTRUMENTS - Interest rate contracts designated as cash flow hedges (Details) - Cash flow hedge - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
DERIVATIVE FINANCIAL INSTRUMENTS |  |  |
Amounts of gross gain (loss) reclassified from accumulated other comprehensive income | $ 87 | $ 175 | $ 167
Taxable loan interest income |  |  |
DERIVATIVE FINANCIAL INSTRUMENTS |  |  |
Amounts of gross gain (loss) reclassified from accumulated other comprehensive income | 116 | $ 175 | 275
Subordinated debentures interest expense |  |  |
DERIVATIVE FINANCIAL INSTRUMENTS |  |  |
Amounts of gross gain (loss) reclassified from accumulated other comprehensive income | $ (29) |  | $ (108)

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- Definition Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 + Details
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