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FAIR VALUE - Summary of Additional Qualitative Information (Details) - Fair Value, Measurements, Nonrecurring - Impaired loans - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate range (percentage)	0.00%	0.00%
Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate range (percentage)	20.00%	20.00%
Appraisal of collateral
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Estimate	$ 6,906	$ 7,173
Appraisal of collateral | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate range (percentage)	7.00%	7.00%
Appraisal of collateral | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate range (percentage)	75.00%	75.00%

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

+ Details

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X

- 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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X

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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