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COMMITMENTS AND CONTINGENCIES - Narrative (Details) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2021 | Dec. 31, 2003
Risk Participation Agreements [Abstract] |  |
Risk participation agreements, maximum term | 9 years |
Minimum |  |
Risk Participation Agreements [Abstract] |  |
Risk participation agreements, average term | 1 year |
Maximum |  |
Risk Participation Agreements [Abstract] |  |
Risk participation agreements, average term | 5 years |
Marketing rights |  |
Marketing Rights [Abstract] |  |
Commitment period |  | 25 years
Financial standby letters of credit |  |
Letters of Credit [Abstract] |  |
Letters of credit outstanding, term | ten years |
Commercial letters of credit |  |
Letters of Credit [Abstract] |  |
Letters of credit outstanding, term | one year |

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- Definition Risk Participation Agreements [Abstract] + References No definition available. + Details
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- Definition Average period covered by risk participation contracts in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Describe the approximate term of the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
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