LOANS AND ALLOWANCE FOR CREDIT LOSSES - CARES Act (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)
Financing Receivable, Modifications [Line Items]
Period of loan deferral and forbearance on principal and interest		3 months
Small Business Administration Paycheck Protection Program \| Paycheck Protection Program Liquidity Facility
Financing Receivable, Modifications [Line Items]
Long term debt	$ 169	$ 169
Stated interest rate (as a percent)	0.35%	0.35%
Small Business Administration Paycheck Protection Program \| Paycheck Protection Program Liquidity Facility \| Minimum
Financing Receivable, Modifications [Line Items]
Term of borrowings	2 years
Small Business Administration Paycheck Protection Program \| Paycheck Protection Program Liquidity Facility \| Maximum
Financing Receivable, Modifications [Line Items]
Term of borrowings	5 years

Period of loan deferral and forbearance under CARES Act.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Section S99
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-Name Accounting Standards Codification
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