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MERGERS AND ACQUISITIONS - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended
	May 01, 2019	Oct. 01, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Apr. 30, 2019	Dec. 31, 2018	Sep. 28, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill			$ 19,925		$ 19,925			$ 12,592		$ 719
Unaudited pro forma net Income			7,566	$ 4,353	13,355	$ 6,869
Unaudited pro forma revenue			38,675	28,862	95,714	87,557
Merger related			471	$ 319	7,976	$ 473
Investment Banking, Legal And Consulting Fees
Business Acquisition [Line Items]
Merger related			0		1,967
Information System Expense
Business Acquisition [Line Items]
Merger related			236		3,855
Other expenses
Business Acquisition [Line Items]
Merger related			$ 235		$ 2,154
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 excluding goodwill		181,430
Loans		141,103
Securities available for sale		7,352
Total liabilities assumed		163,384
Deposits		160,433
Goodwill		$ 11,873
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.
Business Acquisition [Line Items]
Percentage of ownership interests acquired	100.00%
Acquisition, cash paid	$ 14,197
Total assets acquired excluding goodwill	492,844
Loans	347,361
Securities available for sale	60,882
Total liabilities assumed	449,358
Deposits	388,246
Goodwill	7,333
Consideration paid	50,819
Core deposit intangible	$ 4,550
Core deposit intangible amortization period	10 years
Hamilton Bancorp, Inc. | Common Stock
Business Acquisition [Line Items]
Shares issued for common stock (in shares)	1,765,704
Price per share (in usd per share)							$ 20.74

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