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FAIR VALUE MEASUREMENTS - Fair Value on a Recurring Basis (Details) - Interest rate swap	12 Months Ended
	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)
Cash flow hedges
Interest rate derivatives
Number of interest rate derivatives held | item	27
Number of mortgage loans outstanding | item	27
Notional Amount	$ 117,348,000
Weighted average maturity	5 years 10 months 24 days
Weighted average annual interest rate (as a percent)	4.13%
Cash flow hedges | Minimum
Interest rate derivatives
Fixed Interest Rate (as a percent)	3.02%
Cash flow hedges | Maximum
Interest rate derivatives
Fixed Interest Rate (as a percent)	5.38%
Recurring | Level 2
Financial assets:
Derivative financial instruments	$ 2,399,000	$ 1,615,000
Financial liabilities:
Derivative financial instruments	$ 505,000	$ 1,492,000

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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

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Represents the number of mortgage loans outstanding related to derivative instruments at the balance sheet date.

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Average fixed interest rate related to the group of interest rate derivatives.

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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.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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-Publisher FASB
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-Topic 210
-SubTopic 20
-Section 55
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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fixed interest rate related to the interest rate derivative.

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Number of interest rate derivative instruments held by the entity at the reporting date.

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