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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Purchases and Sales Additional Information (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 25, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Oct. 27, 2016
Receivables [Abstract] |  |  |  |  |
Discount on loans and leases purchased |  | $ 0 | $ 0 | $ 1,400,000 |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from sale of loans held-for-investment |  | $ 605,502,000 | 930,342,000 | 575,477,000 |
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 |  |  | $ 242,700,000 |  | $ 217,200,000
Americas United Bank (AUB) |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from sale of loans held-for-investment | $ 40,200,000 |  |  | $ 40,200,000 |

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