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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Purchase Credit Impaired Loans Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Net gain on sale of loans | $ 5,735 |  | $ 11,063 | $ 10,737 | $ 15,405
Total unpaid principal balance of sold PCI loans |  |  | 98,300 |  | 98,300
Total fair value of sold PCI loans |  |  | 82,400 |  | 82,400
Gain on sale of PCI loans |  |  | $ 4,400 |  | $ 4,400
Consumer | Single family residential mortgage | Purchased Credit Impaired |  |  |  |  |
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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