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INCOME TAXES - Effective Tax Rate Reconciliation (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Computed expected income tax expense (benefit) at Federal statutory rate | 21.00% | 35.00% | 35.00%
Increase (decrease) resulting from: |  |  |
Proportional amortization | 4.30% | 5.10% | 0.40%
Other permanent book-tax differences | 0.40% | (2.10%) | 0.20%
State tax expense, net of federal benefit | 5.90% | 3.70% | 6.40%
Income tax credits | (25.40%) | (149.50%) | (33.90%)
Basis reduction in investment in alternative energy partnership | 2.20% | 24.90% | 5.80%
Write-off of Goodwill for discontinued operations | 0.00% | 2.70% | 0.00%
Bank owned life insurance policies | (1.00%) | (3.00%) | (0.80%)
Equity compensation windfall tax benefits | (0.50%) | (7.00%) | (0.00%)
Remeasurement from the Tax Cuts and Jobs Act | 0.00% | (7.80%) | 0.00%
Reserve for uncertain tax positions | 0.10% | 1.90% | 0.00%
Other, net | 3.30% | (2.70%) | 0.60%
Effective tax rates | 10.30% | (98.80%) | 13.70%

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