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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Assets and Liabilitie (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 30, 2019 | Mar. 31, 2019
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 580,372 | $ 182,239 |  |  |
Fair Value Asset (Liability) | (743) | 811 |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income | 1,768 | 486 | $ (838) |  |
Amount of Gain (Loss) Reclassified from Other Comprehensive Income | 3,156 | 0 |  |  |
Amount of Gain (Loss) Recognized in Income | (630) | (510) |  |  |
Not Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 21,748 | 92,239 |  |  |
Fair Value Asset (Liability) | 59 | 8 |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income |  | 0 |  |  |
Not Designated as Hedging Instrument | Interest rate lock commitments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income | 0 | 0 |  |  |
Not Designated as Hedging Instrument | Customer loan derivative liability |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  | $ 45,641 |  |  |
Weighted Average Maturity |  | 9 years 10 months 24 days |  |  |
Fair Value Asset (Liability) |  | $ (1,353) |  |  |
Not Designated as Hedging Instrument | Customer loan derivative asset |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  | $ 45,641 |  |  |
Weighted Average Maturity |  | 9 years 10 months 24 days |  |  |
Fair Value Asset (Liability) |  | $ 1,353 |  |  |
Cash Flow Hedges | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 100,000 | 90,000 |  |  |
Fair Value Asset (Liability) | (1,311) | 803 |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income | 2,291 | 486 |  |  |
Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swap on deposits |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  |  |  | $ 50,000 | $ 50,000
Amount of Gain (Loss) Recognized in Other Comprehensive Income | 2,291 |  |  |  |
Cash Flow Hedges | Designated as Hedging Instrument | Interest rate caps agreements |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income | 0 | 486 |  |  |
Fair Value Hedging | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 37,190 |  |  |  |
Fair Value Asset (Liability) | 593 |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income | (523) |  |  |  |
Fair Value Hedging | Designated as Hedging Instrument | Interest rate swap on deposits |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 37,200 |  |  |  |
Fair Value Hedging | Designated as Hedging Instrument | Interest rate swap on securities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income | (523) |  |  |  |
Economic hedges: | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | 421,434 |  |  |  |
Fair Value Asset (Liability) | (84) |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income | 0 | 0 |  |  |
Economic hedges: | Designated as Hedging Instrument | Forward sale commitments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income | 0 | 0 |  |  |
Economic hedges: | Designated as Hedging Instrument | Customer Loan Swaps - MNA Counterparty |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 135,598 |  |  |  |
Weighted Average Maturity | 7 years 6 months |  |  |  |
Fair Value Asset (Liability) | $ (4,669) |  |  |  |
Economic hedges: | Designated as Hedging Instrument | Customer Loan Swaps - RPA Counterparty |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 69,505 |  |  |  |
Weighted Average Maturity | 8 years 9 months 18 days |  |  |  |
Fair Value Asset (Liability) | $ (3,377) |  |  |  |
Economic hedges: | Designated as Hedging Instrument | Customer Loan Swaps - Customer |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 205,103 |  |  |  |
Weighted Average Maturity | 8 years 1 month 6 days |  |  |  |
Fair Value Asset (Liability) | $ 8,046 |  |  |  |
Other liabilities | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swap on deposits |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 100,000 |  |  |  |
Weighted Average Maturity | 4 years 7 months 6 days |  |  |  |
Fair Value Asset (Liability) | $ (1,311) |  |  |  |
Other liabilities | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate caps agreements |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount |  | $ 90,000 |  |  |
Weighted Average Maturity |  | 4 years 1 month 6 days |  |  |
Fair Value Asset (Liability) |  | $ 803 |  |  |
Other liabilities | Fair Value Hedging | Designated as Hedging Instrument | Interest rate swap on securities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 37,190 |  |  |  |
Weighted Average Maturity | 9 years 7 months 6 days |  |  |  |
Fair Value Asset (Liability) | $ 593 |  |  |  |
Other liabilities | Economic hedges: | Designated as Hedging Instrument | Forward sale commitments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 11,228 |  |  |  |
Weighted Average Maturity | 1 month 6 days |  |  |  |
Fair Value Asset (Liability) | $ (84) |  |  |  |
Other assets | Not Designated as Hedging Instrument | Interest rate lock commitments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount | $ 21,748 | $ 957 |  |  |
Weighted Average Maturity | 1 month 6 days | 1 month 6 days |  |  |
Fair Value Asset (Liability) | $ 59 | $ 8 |  |  |
Securities Available for Sale | Fair Value Hedging | Interest rate swap on securities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Carrying Amount of Hedged Assets (Liabilities) | 39,026 | 0 |  |  |
Cumulative Amount of Fair Value Hedging Adjustment in Carrying Amount | 523 | 0 |  |  |
Acquisition, restructuring, and other expenses | Cash Flow Hedges | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified from Other Comprehensive Income |  | 0 |  |  |
Acquisition, restructuring, and other expenses | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate caps agreements |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified from Other Comprehensive Income | 3,156 | 0 |  |  |
Interest expense | Cash Flow Hedges | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified from Other Comprehensive Income | 3,156 |  |  |  |
Interest expense | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swap on deposits |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified from Other Comprehensive Income | 0 |  |  |  |
Interest income | Fair Value Hedging | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified from Other Comprehensive Income | 0 |  |  |  |
Interest income | Fair Value Hedging | Designated as Hedging Instrument | Interest rate swap on securities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified from Other Comprehensive Income | 0 |  |  |  |
Other income | Not Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified from Other Comprehensive Income |  | 0 |  |  |
Other income | Not Designated as Hedging Instrument | Interest rate lock commitments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified from Other Comprehensive Income | 0 | 0 |  |  |
Other income | Economic hedges: | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified from Other Comprehensive Income | 0 | 0 |  |  |
Other income | Economic hedges: | Designated as Hedging Instrument | Forward sale commitments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Reclassified from Other Comprehensive Income | 0 | 0 |  |  |
Interest expense | Cash Flow Hedges | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income | (605) | (519) |  |  |
Interest expense | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate swap on deposits |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income | (2) |  |  |  |
Interest expense | Cash Flow Hedges | Designated as Hedging Instrument | Interest rate caps agreements |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income | (603) | (519) |  |  |
Interest income | Fair Value Hedging | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income | 7 |  |  |  |
Interest income | Fair Value Hedging | Designated as Hedging Instrument | Interest rate swap on securities |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income | 7 |  |  |  |
Other income | Not Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income |  | 9 |  |  |
Other income | Not Designated as Hedging Instrument | Interest rate lock commitments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income | 52 | 9 |  |  |
Other income | Economic hedges: | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income | (84) | 0 |  |  |
Other income | Economic hedges: | Designated as Hedging Instrument | Forward sale commitments |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of Gain (Loss) Recognized in Income | $ (84) | $ 221 |  |  |

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