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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Purchased Credit Impaired Loans Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net gain on sale of loans | $ 11,942 | $ 35,895 | $ 37,211
Total unpaid principal balance of sold PCI loan pools |  | 606,700 | 52,400
Total fair value of sold PCI loan pools |  | 558,000 | 32,500
Gain on sale of PCI loan pools |  | $ 19,200 | $ 9,400
PCI Loans | Consumer | Single family residential mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Aggregate unpaid principal | 147,500 |  |
Aggregate carrying value | 128,400 |  |
Fair value adjustments | (274) |  |
Net gain on sale of loans | $ 3,700 |  |

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- Definition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Gain (Loss) on Loans Sold + References No definition available. + Details
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