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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Impaired Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Recorded Investment with specific reserves	$ 3,608	$ 1,671
Unpaid Principal Balance with specific reserves	3,608	1,699
Interest Income Recognized with specific reserves	17	5
Specific Reserve with specific reserves	1,061	782
Recorded Investment	4,761	1,740
Recorded Investment with no specific reserve	2,595	2,643
Unpaid Principal Balance with no specific reserve	3,331	3,411
Interest Income Recognized with no specific reserve	11	50
Average Recorded Investment with no specific reserve	3,468	3,528
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment with specific reserves	100	160
Unpaid Principal Balance with specific reserves	100	160
Interest Income Recognized with specific reserves		5
Specific Reserve with specific reserves	29	52
Recorded Investment	137	205
Recorded Investment with no specific reserve		49
Unpaid Principal Balance with no specific reserve		49
Indirect
Financing Receivable, Impaired [Line Items]
Recorded Investment with no specific reserve	144	88
Unpaid Principal Balance with no specific reserve	144	88
Commercial
Financing Receivable, Impaired [Line Items]
Recorded Investment with specific reserves	214	217
Unpaid Principal Balance with specific reserves	214	217
Interest Income Recognized with specific reserves	3
Specific Reserve with specific reserves	214	217
Recorded Investment	215	223
Recorded Investment with no specific reserve		2
Unpaid Principal Balance with no specific reserve		2
Average Recorded Investment with no specific reserve		2
Construction
Financing Receivable, Impaired [Line Items]
Recorded Investment with no specific reserve	236	318
Unpaid Principal Balance with no specific reserve	236	318
Average Recorded Investment with no specific reserve	236	322
Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Recorded Investment with specific reserves	2,000
Unpaid Principal Balance with specific reserves	2,000
Interest Income Recognized with specific reserves	14
Specific Reserve with specific reserves	305
Recorded Investment	3,103
Recorded Investment with no specific reserve	1,238	1,194
Unpaid Principal Balance with no specific reserve	1,548	1,194
Interest Income Recognized with no specific reserve	9	39
Average Recorded Investment with no specific reserve	1,666	1,632
Residential Real estate
Financing Receivable, Impaired [Line Items]
Recorded Investment with specific reserves	1,294	1,294
Unpaid Principal Balance with specific reserves	1,294	1,322
Specific Reserve with specific reserves	513	513
Recorded Investment	1,306	1,312
Recorded Investment with no specific reserve	977	992
Unpaid Principal Balance with no specific reserve	1,403	1,760
Interest Income Recognized with no specific reserve	2	11
Average Recorded Investment with no specific reserve	$ 1,566	$ 1,572

X

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524

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Amount of interest income, recognized on cash basis, on financing receivables, for which there is no related allowance for credit losses and are recognized as impaired.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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+ References

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-Subparagraph (b)
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+ References

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-Publisher FASB
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-Topic 310
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 310
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-Section 50
-Paragraph 15
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-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524

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+ References

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