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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Mar. 31, 2019
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | $ 499,142 |  | $ 499,142 |  | $ 182,239 |
Estimated Fair Value Asset (Liability) | (2,073) |  | (2,073) |  | 811 |
Designated as hedging instrument | Cash flow hedges |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 140,000 |  | 140,000 |  | $ 90,000 |
Weighted Average Maturity (in years) |  |  |  |  |  |
Estimated Fair Value Asset (Liability) | (2,090) |  | (2,090) |  | $ 803 |
Designated as hedging instrument | Cash flow hedges | Interest rate cap agreements |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 90,000 |  | $ 90,000 |  | $ 90,000 |
Weighted Average Maturity (in years) |  |  | 3 years 4 months 24 days |  | 4 years 1 month 6 days |
Estimated Fair Value Asset (Liability) | 89 |  | $ 89 |  | $ 803 |
Realized gain (loss) | (183) | $ (137) | (521) | $ (367) |  |
Designated as hedging instrument | Cash flow hedges | Interest rate swap on deposits |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 50,000 |  | $ 50,000 |  |  | $ 50,000
Weighted Average Maturity (in years) |  |  | 4 years 6 months |  |  |
Estimated Fair Value Asset (Liability) | (2,179) |  | $ (2,179) |  |  |
Realized gain (loss) | 17 | 0 | 17 | 0 |  |
Designated as hedging instrument | Economic hedges |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 7,762 |  | 7,762 |  |  |
Estimated Fair Value Asset (Liability) | (61) |  | (61) |  |  |
Designated as hedging instrument | Economic hedges | Forward sale commitments |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 7,762 |  | $ 7,762 |  |  |
Weighted Average Maturity (in years) |  |  | 1 month 6 days |  |  |
Estimated Fair Value Asset (Liability) | (61) |  | $ (61) |  |  |
Realized gain (loss) | (31) | 43 | (61) | 190 |  |
Not designated as hedging instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 351,380 |  | 351,380 |  | 92,239 |
Estimated Fair Value Asset (Liability) | 78 |  | 78 |  | 8 |
Not designated as hedging instrument | Interest rate lock commitments |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 12,242 |  | $ 12,242 |  | $ 957 |
Weighted Average Maturity (in years) |  |  | 1 month 6 days |  | 1 month 6 days |
Estimated Fair Value Asset (Liability) | 78 |  | $ 78 |  | $ 8 |
Realized gain (loss) | 7 | $ 0 | 70 | $ 9 |  |
Not designated as hedging instrument | Customer loan derivative liability |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 169,569 |  | $ 169,569 |  | $ 45,641 |
Weighted Average Maturity (in years) |  |  | 9 years 9 months 18 days |  | 9 years 10 months 24 days |
Estimated Fair Value Asset (Liability) | (10,923) |  | $ (10,923) |  | $ (1,353) |
Not designated as hedging instrument | Customer loan derivative asset |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional Amount | 169,569 |  | $ 169,569 |  | $ 45,641 |
Weighted Average Maturity (in years) |  |  | 9 years 9 months 18 days |  | 9 years 10 months 24 days |
Estimated Fair Value Asset (Liability) | $ 10,923 |  | $ 10,923 |  | $ 1,353 |

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 + Details
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- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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