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MERGERS AND ACQUISITIONS (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended
	May 01, 2019	Oct. 01, 2018	Mar. 31, 2018	Mar. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill				$ 12,592	$ 12,592
Assets of acquiree				1,973,283	1,934,388
Loans of acquiree				1,251,256	1,233,643
Deposits of acquiree				$ 1,620,696	1,558,756
Hamilton Bancorp, Inc.
Business Acquisition [Line Items]
Assets of acquiree					496,254
Loans of acquiree					369,457
Deposits of acquiree					$ 384,171
Hamilton Bancorp, Inc. | Subsequent Event
Business Acquisition [Line Items]
Cash paid per acquiree shares (in usd per share)	$ 4.10
Common Stock | Hamilton Bancorp, Inc. | Subsequent Event
Business Acquisition [Line Items]
Acquisition stock exchange ratio	0.54
Mercersburg Financial Corporation
Business Acquisition [Line Items]
Percentage of ownership interests acquired		100.00%
Acquisition, cash paid		$ 4,866
Consideration paid for acquisition		29,919
Total assets acquired		181,430
Loans acquired		141,103
Investment securities acquired		7,352
Total liabilities assumed		163,384
Deposits		160,433
Goodwill		$ 11,873
Unaudited pro forma net Income			$ 3,925
Unaudited pro forma revenue			$ 22,013
Mercersburg Financial Corporation | Common Stock
Business Acquisition [Line Items]
Shares issued for common stock (in shares)		1,052,635
Price per share (in usd per share)		$ 23.80
Hamilton Bancorp, Inc. | Subsequent Event
Business Acquisition [Line Items]
Percentage of ownership interests acquired	100.00%
Consideration paid	$ 50,000
Hamilton Bancorp, Inc. | Hamilton Bancorp, Inc. | Subsequent Event
Business Acquisition [Line Items]
Acquisition, cash paid	$ 13,400
Hamilton Bancorp, Inc. | Common Stock | Subsequent Event
Business Acquisition [Line Items]
Shares issued for common stock (in shares)	1,765,000

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