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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Purchases and Sales Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2016 | Oct. 27, 2016
Receivables [Abstract] |  |  |
Premium on loans and leases purchased | $ 2.3 |  |
Commercial Equipment Finance | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Equipment leases disposed of |  | $ 242.7 | $ 217.2

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