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INCOME TAXES - Effective Tax Rate Reconciliation (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Computed expected income tax expense (benefit) at Federal statutory rate | 35.00% | 35.00% | 35.00%
Increase (decrease) resulting from: |  |  |
Proportional amortization | 5.10% | 0.40% | 1.10%
Other permanent book-tax differences | (2.10%) | 0.20% | (0.10%)
State tax expense, net of federal benefit | 3.70% | 6.40% | 5.90%
Income tax credits | (149.50%) | (33.90%) | (0.90%)
Initial book-tax difference on investments in alternative energy partnership | 24.90% | 5.80% | 0.00%
Write-off of Goodwill for discontinued operations | 2.70% | 0.00% | 0.00%
Bank owned life insurance policies | (3.00%) | (0.80%) | (0.50%)
Equity compensation windfall tax benefits | (7.00%) | (0.00%) | (0.00%)
Remeasurement from the Tax Cuts and Jobs Act | (7.80%) | 0.00% | 0.00%
Reserve for uncertain tax positions | 1.90% | 0.00% | 0.00%
Other, net | (2.70%) | 0.60% | 0.10%
Effective tax rates | (98.80%) | 13.70% | 40.60%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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