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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Affordable Housing Fund Investment (Details) - Affordable Housing Partnerships | 12 Months Ended
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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 No definition available. + Details
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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 + Details
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