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PENDING ACQUISITION (Details) - USD ($) $ / shares in Units, $ in Thousands | May 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Assets of acquiree |  | $ 1,644,118 | $ 1,558,849
Shares of common stock outstanding (in shares) |  | 8,400,697 | 8,347,039
Mercersburg Financial Corporation |  |  |
Business Acquisition [Line Items] |  |  |
Consideration transferred, cash paid per acquiree shares (in usd per share) | $ 40.00 |  |
Acquisition stock exchange ratio | 1.5291 |  |
Common stock of acquiree converted to Company's common stock, percentage | 85.00% |  |
Common stock of acquiree converted to cash, percentage | 15.00% |  |
Mercersburg Financial Corporation |  |  |
Business Acquisition [Line Items] |  |  |
Assets of acquiree |  | $ 183,000 |
Shares of common stock outstanding (in shares) |  | 810,080 |

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