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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2014
Derivative [Line Items] |  |  |  |
Notional amount of interest rate swap |  | $ 412,133 | $ 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 on deposits |  |  |  |
Derivative [Line Items] |  |  |  |
Deposit liabilities, collateral issued to counterparty, interest rate swap |  | 5,700 |  |
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 on deposits |  |  |  |
Derivative [Line Items] |  |  |  |
Term of interest rate swap | 5 years |  |  |
Rate of interest rate swap | 2.461% |  |  |
Notional amount of interest rate swap | $ 50,000 | $ 50,000 |  |

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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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