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MERGERS AND ACQUISITIONS - Narrative (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Oct. 23, 2018 $ / shares	Oct. 01, 2018 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Shares of common stock issued for acquisition (in shares) | shares			1,052,635	0	0
Goodwill			$ 12,592	$ 719	$ 719	$ 0
Unaudited pro forma net income			15,717	8,929
Pro forma revenue			92,996	79,659
Merger related expenses			3,197	0	$ 0
Assets			1,934,388	1,558,849
Loans			1,233,643	997,216
Deposits			1,558,756	$ 1,219,515
Other Expenses
Business Acquisition [Line Items]
Merger related expenses			630
Information Systems
Business Acquisition [Line Items]
Merger related expenses			1,065
Investment Banking
Business Acquisition [Line Items]
Merger related expenses			1,502
Core Deposit Intangibles
Business Acquisition [Line Items]
Amortization Period		10 years
Mercersburg Financial Corporation
Business Acquisition [Line Items]
Percentage of interests acquired		100.00%
Cash paid		$ 4,866
Cash paid per acquiree shares (in usd per share) | $ / shares		$ 40.00
Total Consideration Transferred		$ 29,919
Total assets acquired		181,430
Loans acquired		141,103
Securities available for sale		7,352
Total liabilities assumed		163,384
Deposits		160,433
Goodwill		11,873
Core deposit intangibles		$ 3,840
Mercersburg Financial Corporation | Common Stock
Business Acquisition [Line Items]
Closing stock price per share (in shares) | $ / shares		$ 23.80
Mercersburg Financial Corporation | Common Stock
Business Acquisition [Line Items]
Shares of common stock issued for acquisition (in shares) | shares		1,052,635
Common stock for each share converted (in shares) | shares		1.5291
Hamilton Bancorp Inc. | Hamilton Bancorp Inc.
Business Acquisition [Line Items]
Assets			496,254
Loans			369,457
Deposits			$ 384,171
Shares, Outstanding | shares			3,416,414
Hamilton Bancorp Inc. | Common Stock
Business Acquisition [Line Items]
Cash paid per acquiree shares (in usd per share) | $ / shares	$ 4.10
Acquisition stock exchange ratio	0.54

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