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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Net gain on sale of loans | $ 279 | $ 5,735 | $ 1,059 | $ 10,737
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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