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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