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LOANS AND LEASES - Additional Information (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Restructured Loans, Nonaccrual Status | $ 6,000,000.0 |  | $ 6,400,000 |
Write-downs | 123,000 | $ 109,000 |  |
Gain (loss) on sale of other real estate owned | (77,000) | (24,000) |  |
Real Estate Acquired Through Foreclosure | 1,065,000 | 5,300,000 | 2,781,000 | $ 6,284,000
FDIC indemnification asset | 0 |  | $ 1,900,000 |
Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum | 250,000 |  |  |
Residential real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum | 250,000 |  |  |
Write-downs | $ 26,000 | $ 63,000 |  |

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