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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Loans and Leases by Class Modified as Troubled Debt Restructurings (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) Loan | Dec. 31, 2016 USD ($) Loan | Dec. 31, 2015 USD ($) Loan
Commercial | Commercial and industrial |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 1 | 0 | 0
Pre- Modification Outstanding Recorded Investment | $ 2,706 | $ 0 | $ 0
Post-Modification Outstanding Recorded Investment | $ 2,706 | $ 0 | $ 0
Consumer |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 4 | 42 | 14
Pre- Modification Outstanding Recorded Investment | $ 5,122 | $ 10,278 | $ 4,832
Post-Modification Outstanding Recorded Investment | $ 5,139 | $ 10,273 | $ 4,752
Consumer | Single family residential mortgage |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 3 | 42 | 13
Pre- Modification Outstanding Recorded Investment | $ 2,416 | $ 10,278 | $ 4,571
Post-Modification Outstanding Recorded Investment | $ 2,433 | $ 10,273 | $ 4,493
Consumer | Other consumer |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Loans | Loan | 0 | 0 | 1
Pre- Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 261
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 | $ 259

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