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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Mar. 31, 2019
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |  |
Notional Amount | $ 412,133 |  | $ 412,133 |  | $ 182,239 |
Estimated Fair Value Asset (Liability) | (1,495) |  | (1,495) |  | 811 |
Designated as hedging instrument | Cash flow hedges: |  |  |  |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |  |
Notional Amount | 140,000 |  | 140,000 |  | $ 90,000 |
Weighted Average Maturity (in years) |  |  |  |  |  |
Estimated Fair Value Asset (Liability) | (1,536) |  | (1,536) |  | $ 803 |
Designated as hedging instrument | Cash flow hedges: | Interest rate cap agreements |  |  |  |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |  |
Notional Amount | 90,000 |  | $ 90,000 |  | $ 90,000 |
Weighted Average Maturity (in years) |  |  | 3 years 7 months 6 days |  | 4 years 1 month 6 days |
Estimated Fair Value Asset (Liability) | 174 |  | $ 174 |  | $ 803 |
Realized gains (losses) | (174) | $ (122) | (337) | $ (230) |  |
Designated as hedging instrument | Cash flow hedges: | Interest rate swap on deposits |  |  |  |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |  |
Notional Amount | 50,000 |  | $ 50,000 |  |  | $ 50,000
Weighted Average Maturity (in years) |  |  | 4 years 9 months 18 days |  |  |
Estimated Fair Value Asset (Liability) | (1,710) |  | $ (1,710) |  |  |
Designated as hedging instrument | Economic hedges: |  |  |  |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |  |
Notional Amount | 3,561 |  | 3,561 |  |  |
Estimated Fair Value Asset (Liability) | (30) |  | (30) |  |  |
Designated as hedging instrument | Economic hedges: | Forward sale commitments |  |  |  |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |  |
Notional Amount | 3,561 |  | $ 3,561 |  |  |
Weighted Average Maturity (in years) |  |  | 1 month 6 days |  |  |
Estimated Fair Value Asset (Liability) | (30) |  | $ (30) |  |  |
Realized gains (losses) | 35 | (23) | (30) | 147 |  |
Not designated as hedging instrument |  |  |  |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |  |
Notional Amount | 268,572 |  | 268,572 |  | 92,239 |
Estimated Fair Value Asset (Liability) | 71 |  | 71 |  | 8 |
Not designated as hedging instrument | Interest rate lock commitments |  |  |  |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |  |
Notional Amount | 8,082 |  | $ 8,082 |  | $ 957 |
Weighted Average Maturity (in years) |  |  | 1 month 6 days |  | 1 month 6 days |
Estimated Fair Value Asset (Liability) | 71 |  | $ 71 |  | $ 8 |
Realized gains (losses) | 57 | $ 1 | 63 | $ 9 |  |
Not designated as hedging instrument | Customer loan derivative liability |  |  |  |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |  |
Notional Amount | 130,245 |  | $ 130,245 |  | $ 45,641 |
Weighted Average Maturity (in years) |  |  | 9 years 2 months 12 days |  | 9 years 10 months 24 days |
Estimated Fair Value Asset (Liability) | (6,887) |  | $ (6,887) |  | $ (1,353) |
Not designated as hedging instrument | Customer loan derivative asset |  |  |  |  |  |
Interest rate swap agreements and non-hedging derivative assets and liabilities |  |  |  |  |  |
Notional Amount | 130,245 |  | $ 130,245 |  | $ 45,641 |
Weighted Average Maturity (in years) |  |  | 9 years 2 months 12 days |  | 9 years 10 months 24 days |
Estimated Fair Value Asset (Liability) | $ 6,887 |  | $ 6,887 |  | $ 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 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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- 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=118932676&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=116637391&loc=SL114874048-224260 + Details
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