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VARIABLE INTEREST ENTITIES - Balances and Activity in Affordable Housing Partnerships (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Fundings	$ 27,832	$ 14,800	$ 6,361
Income tax credits recognized		3,400	9,600
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum loss exposure	32,525
Maximum loss exposure	27,977	32,525
Affordable Housing Fund Investment
Variable Interest Entity [Line Items]
Unfunded commitment	18,300
Fundings	16,086	9,143	4,102
Proportional amortization recognized	5,253	3,521	2,010
Affordable Housing Fund Investment | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum loss exposure	36,462
Aggregate funding commitment	61,278	49,278
Total amount funded	42,991	26,905
Unfunded commitment	18,287	22,373
Maximum loss exposure	43,209	36,462
Income tax credits recognized	$ 4,300	$ 2,410	$ 1,882

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Amount of amortization expense of investment in qualified affordable housing projects.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to investment tax credit.

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