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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Summary of recorded investment amount and related allowance for losses of impaired loans (Details)	6 Months Ended
	Jun. 30, 2018 USD ($) borrower loan	Jun. 30, 2017 borrower	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Financing Receivable, Impaired [Line Items]
Allowance for loan loss	$ 2,284,000		$ 2,589,000	$ 2,484,000
Loans outstanding included in current and 30 - 89 days past due	$ 1,000,000
Number of borrowers | borrower	25	38
Specific Reserve	$ 226,000
Home Equity
Financing Receivable, Impaired [Line Items]
Loans outstanding included in current and 30 - 89 days past due	159,000
Consumer
Financing Receivable, Impaired [Line Items]
Allowance for loan loss	$ 177,000		214,000	182,000
Number of loans | loan	2
Amount of consumer and indirect loans, outstanding	$ 96,109
Amount of consumer and indirect loans, specific reserves	$ 26,827
Number of borrowers | borrower	2
Commercial
Financing Receivable, Impaired [Line Items]
Allowance for loan loss	$ 246,000		237,000	284,000
Loans outstanding included in current and 30 - 89 days past due	211,000
Specific Reserve	211,000
Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Allowance for loan loss	390,000		$ 291,000	$ 259,000
Loans outstanding included in current and 30 - 89 days past due	$ 646,000

X

- Definition

Loans And Leases Receivable Consumer And Indirect Loans

+ References

No definition available.

+ Details

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- Definition

Represents loans and leases receivable consumer and indirect loans

+ References

No definition available.

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X

- Definition

Represents loans outstanding included in the current and 30-89 days past due.

+ References

No definition available.

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- Definition

Represents number of borrowers consumer and indirect loans.

+ References

No definition available.

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- Definition

Represents number of loans.

+ References

No definition available.

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X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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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.

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- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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