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VARIABLE INTEREST ENTITIES - Balances and Activity in Affordable Housing Partnerships (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Variable Interest Entity [Line Items]
Funding of equity investment	$ 4,437	$ 574
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum loss exposure	32,525
Maximum loss exposure	27,347
Tax credit	458	527
Affordable Housing Fund Investment
Variable Interest Entity [Line Items]
Alternative investments unfunded investment commitments	17,800
Funding of equity investment	4,559	454
Amortization expense	1,147	637
Affordable Housing Fund Investment | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Maximum loss exposure	36,462
Aggregate funding commitment	49,278		$ 49,278
Total amount funded	31,464		26,905
Alternative investments unfunded investment commitments	17,814		$ 22,373
Maximum loss exposure	35,315
Tax credit	$ 1,056	$ 555

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

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