INVESTMENT SECURITIES - Schedule of unrealized/unrecognized loss position of held-to-maturity (Details 6) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Held-to-maturity Securities [Abstract]
Less than 12 Months, Estimated Fair Value	$ 2,909	$ 3,260
Less than 12 Months, Unrealized/Unrecognized Losses	(95)	(33)
12 months or more, Estimated Fair Value	1,848	2,045
12 months or more, Unrealized/Unrecognized Losses	(108)	(65)
Total, Estimated Fair Value	4,757	5,305
Total, Unrealized/Unrecognized Losses	(203)	(98)
Residential mortgage-backed securities
Held-to-maturity Securities [Abstract]
Less than 12 Months, Estimated Fair Value	2,909	3,260
Less than 12 Months, Unrealized/Unrecognized Losses	(95)	(33)
12 months or more, Estimated Fair Value	1,848	2,045
12 months or more, Unrealized/Unrecognized Losses	(108)	(65)
Total, Estimated Fair Value	4,757	5,305
Total, Unrealized/Unrecognized Losses	$ (203)	$ (98)

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- Definition

Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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- Definition

Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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- Definition

Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for less than 12 months.

+ References

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for less than 12 months.

+ References

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for 12 months or longer.

+ References

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