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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019 | Apr. 30, 2020
Derivative [Line Items] |  |  |
Notional Amount | $ 822,929 | $ 580,372 |
Estimated Fair Value Asset (Liability) | (3,453) | (743) |
Interest rate swap |  |  |
Derivative [Line Items] |  |  |
Notional Amount |  | 50,000 | $ 25,000
Designated as hedging instrument | Cash flow hedges |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 125,000 | 100,000 |
Weighted Average Maturity (in years) | 4 years 1 month 6 days |  |
Estimated Fair Value Asset (Liability) | $ (6,835) | (1,311) |
Designated as hedging instrument | Cash flow hedges | Interest rate cap agreements |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 125,000 | $ 100,000 |
Weighted Average Maturity (in years) | 4 years 1 month 6 days | 4 years 7 months 6 days |
Estimated Fair Value Asset (Liability) | $ (6,835) | $ (1,311) |
Designated as hedging instrument | Fair value hedges |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 37,190 | 37,190 |
Weighted Average Maturity (in years) | 8 years 8 months 12 days |  |
Estimated Fair Value Asset (Liability) | $ 3,445 | 593 |
Designated as hedging instrument | Fair value hedges | Interest rate swap |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 37,190 | $ 37,190 |
Weighted Average Maturity (in years) | 8 years 8 months 12 days | 9 years 7 months 6 days |
Estimated Fair Value Asset (Liability) | $ 3,445 | $ 593 |
Hedged Asset, Fair Value Hedge | 42,564 | 39,026 |
Cumulative amount of fair value hedging adjustment in carrying amount | 5,374 | 523 |
Designated as hedging instrument | Economic hedges |  |  |
Derivative [Line Items] |  |  |
Notional Amount | 633,009 | 421,434 |
Estimated Fair Value Asset (Liability) | (87) | (84) |
Designated as hedging instrument | Economic hedges | Forward sale commitments |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 47,739 | $ 11,228 |
Weighted Average Maturity (in years) | 2 months 12 days | 1 month 6 days |
Estimated Fair Value Asset (Liability) | $ (87) | $ (84) |
Designated as hedging instrument | Economic hedges | Customer loan derivative liability | MNA counterparty |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 189,244 | $ 135,598 |
Weighted Average Maturity (in years) | 7 years 1 month 6 days | 7 years 6 months |
Estimated Fair Value Asset (Liability) | $ (16,965) | $ (4,669) |
Designated as hedging instrument | Economic hedges | Customer loan derivative liability | RPA counterparty |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 103,391 | $ 69,505 |
Weighted Average Maturity (in years) | 7 years 9 months 18 days | 8 years 9 months 18 days |
Estimated Fair Value Asset (Liability) | $ (11,071) | $ (3,377) |
Designated as hedging instrument | Economic hedges | Customer loan derivative liability | Customer |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 292,635 | $ 205,103 |
Weighted Average Maturity (in years) | 7 years 4 months 24 days | 8 years 1 month 6 days |
Estimated Fair Value Asset (Liability) | $ 28,036 | $ 8,046 |
Not designated as hedging instrument |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 27,730 | 21,748 |
Weighted Average Maturity (in years) | 1 month 6 days |  |
Estimated Fair Value Asset (Liability) | $ 24 | 59 |
Not designated as hedging instrument | Interest Rate Lock Commitment |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 27,730 | $ 21,748 |
Weighted Average Maturity (in years) | 1 month 6 days | 1 month 6 days |
Estimated Fair Value Asset (Liability) | $ 24 | $ 59 |

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