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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2014
Derivative [Line Items] |  |  |
Notional amount of interest rate swap | $ 265,453 | $ 182,239 |
Interest rate cap agreements |  |  |
Derivative [Line Items] |  |  |
Premiums paid |  |  | $ 4,600
Cap interest rate |  |  | 3.00%
Effective percentage interest rate, maximum |  |  | 3.00%
Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Deposit liabilities, collateral issued to counterparty, interest rate swap | 1,900 |  |
Designated as hedging instrument | Cash flow hedges: |  |  |
Derivative [Line Items] |  |  |
Notional amount of interest rate swap | 140,000 | 90,000 |
Designated as hedging instrument | Cash flow hedges: | Interest rate cap agreements |  |  |
Derivative [Line Items] |  |  |
Notional amount of interest rate swap | $ 90,000 | $ 90,000 |
Designated as hedging instrument | Cash flow hedges: | Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Term of interest rate swap | 5 years |  |
Rate if interest rate swap | 2.461% |  |
Notional amount of interest rate swap | $ 50,000 |  |

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- Definition Derivative, Premium + References No definition available. + Details
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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 The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract. + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + 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 Period the derivative contract is outstanding, 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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