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INCOME TAXES - Effective Tax Rate Reconciliation (Details)	12 Months Ended
	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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