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VARIABLE INTEREST ENTITIES - Balances and Activity in Affordable Housing Partnerships (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2020
Variable Interest Entity [Line Items]
Funding of equity investment	$ 876	$ 4,437
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum loss exposure	27,977
Maximum loss exposure	23,809
Income tax credits recognized	992	458
Affordable Housing Fund Investment
Variable Interest Entity [Line Items]
Alternative investments unfunded investment commitments	17,300
Funding of equity investment		1,003	$ 4,559
Proportional amortization recognized		1,182	1,147
Affordable Housing Fund Investment | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum loss exposure	43,209
Aggregate funding commitment	61,278			$ 61,278
Total amount funded	43,994			42,991
Alternative investments unfunded investment commitments	17,284			$ 18,287
Maximum loss exposure	$ 42,027
Income tax credits recognized		$ 1,116	$ 1,056

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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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The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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