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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |
Notional Amount | $ 170,398 |  | $ 170,398 |  | $ 130,205
Estimated Fair Value Asset (Liability) | 1,457 |  | 1,457 |  | 447
Designated as hedging instrument | Cash flow hedges: |  |  |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |
Notional Amount | 90,000 |  | 90,000 |  | 90,000
Estimated Fair Value Asset (Liability) | 1,480 |  | 1,480 |  | 669
Designated as hedging instrument | Cash flow hedges: | Interest rate caps agreements |  |  |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |
Notional Amount | 90,000 |  | $ 90,000 |  | $ 90,000
Weighted Average Maturity |  |  | 4 years 4 months 24 days |  | 5 years 1 month 6 days
Estimated Fair Value Asset (Liability) | 1,480 |  | $ 1,480 |  | $ 669
Realized gains (losses) | (137) | $ 74 | (367) | $ 168 |
Designated as hedging instrument | Economic hedges: |  |  |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |
Notional Amount | 1,803 |  | 1,803 |  | 20,352
Estimated Fair Value Asset (Liability) | (31) |  | (31) |  | (221)
Designated as hedging instrument | Economic hedges: | Forward sale commitments |  |  |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |
Notional Amount | 1,803 |  | $ 1,803 |  | $ 20,352
Weighted Average Maturity |  |  | 1 month 6 days |  | 2 months 12 days
Estimated Fair Value Asset (Liability) | (31) |  | $ (31) |  | $ (221)
Realized gains (losses) | 43 | 58 | 190 | (29) |
Not designated as hedging instrument |  |  |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |
Notional Amount | 78,595 |  | 78,595 |  | 19,853
Estimated Fair Value Asset (Liability) | 8 |  | 8 |  | (1)
Not designated as hedging instrument | Interest rate lock commitments |  |  |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |
Notional Amount | 2,499 |  | $ 2,499 |  | $ 19,853
Weighted Average Maturity |  |  | 2 months 12 days |  | 2 months 12 days
Estimated Fair Value Asset (Liability) | 8 |  | $ 8 |  | $ (1)
Realized gains (losses) | 0 | $ 19 | 9 | $ (5) |
Not designated as hedging instrument | Customer loan derivative liability |  |  |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |
Notional Amount | 38,048 |  | $ 38,048 |  |
Weighted Average Maturity |  |  | 15 years 4 months 24 days |  |
Estimated Fair Value Asset (Liability) | (503) |  | $ (503) |  |
Not designated as hedging instrument | Customer loan derivative asset |  |  |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |
Notional Amount | 38,048 |  | $ 38,048 |  |
Weighted Average Maturity |  |  | 15 years 4 months 24 days |  |
Estimated Fair Value Asset (Liability) | $ 503 |  | $ 503 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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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=6945355&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 The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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