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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Premises and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Other Assets |  |
Property, Plant and Equipment [Line Items] |  |
Premises held-for-sale | $ 1.1 | $ 5.2
Minimum | Buildings and improvements, including leasehold improvements |  |
Property, Plant and Equipment [Line Items] |  |
Useful life | 10 years |
Minimum | Furniture and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Useful life | 3 years |
Maximum | Buildings and improvements, including leasehold improvements |  |
Property, Plant and Equipment [Line Items] |  |
Useful life | 40 years |
Maximum | Furniture and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Useful life | 15 years |

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- Definition Amount of assets held-for-sale that are not part of a disposal group. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121558832&loc=d3e400-110220 + Details
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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. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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