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INCOME TAXES - Effective Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Computed expected income tax expense (benefit) at Federal statutory rate	21.00%	21.00%	35.00%
Increase (decrease) resulting from:
Proportional amortization	12.60%	4.30%	5.10%
Other permanent book-tax differences	(2.40%)	0.40%	(2.10%)
State tax expense, net of federal benefit	5.10%	5.90%	3.70%
Income tax credits (investment tax credits and other)	(21.30%)	(25.40%)	(149.50%)
Basis reduction in investment in alternative energy partnership	1.30%	2.20%	24.90%
Write-off of Goodwill for discontinued operations	0.00%	0.00%	2.70%
Bank owned life insurance policies	(1.70%)	(1.00%)	(3.00%)
Equity compensation shortfall (windfall) tax impact	0.60%	(0.50%)	(7.00%)
Remeasurement from the Tax Cuts and Jobs Act	0.00%	0.00%	(7.80%)
Reserve for uncertain tax positions	(1.00%)	0.10%	1.90%
Other, net	0.90%	3.30%	(2.70%)
Effective tax rates	15.10%	10.30%	(98.80%)

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