DERIVATIVE FINANCIAL INSTRUMENTS - Additional Information (Details)	6 Months Ended
Jun. 30, 2018 USD ($)
Derivative [Line Items]
Derivative hedge Ineffectiveness gain (loss)	$ 0
Interest rate cash flow hedge increase decrease interest expense to be reclassified during next 12 months net	1,000,000
Interest rate cash flow hedge gain (loss) reclassified to earnings, net	200,000
Notional	214,230,000
Termination value of derivatives	(3,624,000)
Collateral value against obligations	5,900,000
Designated as Hedging Instrument
Derivative [Line Items]
Notional	75,000,000
Accrued Liabilities
Derivative [Line Items]
Termination value of derivatives	$ 4,500,000

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

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Fair value of securities received as collateral against derivative assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226013-175313

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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

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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.

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No definition available.

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Amount of gain (loss) from the ineffectiveness of the hedge.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
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The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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