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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Affordable Housing Fund Investment (Details) - Affordable Housing Partnerships	12 Months Ended
	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Compliance period to fully utilize tax credits	15 years
Minimum
Schedule of Equity Method Investments [Line Items]
Ownership percentage of limited partnership	8.00%
Maximum
Schedule of Equity Method Investments [Line Items]
Ownership percentage of limited partnership	14.00%

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- Definition

Equity Method Investments, Compliance Period to Fully Utilize Tax Credits

+ References

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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