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MERGERS AND ACQUISITIONS - Schedule of Fair Value Adjustments Made to the Amortized Cost Basis of Loans (Details) - Mercersburg Financial Corporation $ in Thousands	Oct. 01, 2018 USD ($)
Business Acquisition [Line Items]
Gross amortized cost basis at acquisition	$ 149,162
Market rate adjustment	(3,464)
Credit fair value adjustment on non-credit impaired loans	(1,400)
Credit fair value adjustment on impaired loans	(3,195)
Estimated fair value of acquired loans	$ 141,103

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