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INCOME TAXES - Effective Tax Rate Reconciliation (Details)	12 Months Ended
	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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Effective Income Tax Rate Reconciliation, Initial Book-Tax Difference On Alternative Energy Partnership Investments, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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