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Investment securities - Restricted Investment In Stock (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) shares	Dec. 31, 2017 USD ($)
Other-than-temporary impairments recognized	$ 0
Value of common stock	$ 14,798	$ 14,793
Visa Class A stock
Conversion ratio of common stock	1.6298
Visa Class B stock
Shares held | shares	44,982
Value of common stock	$ 0
Federal Home Loan Bank of Pittsburgh (FHLB)
Value of common stock	7,785	$ 8,520
Atlantic Community Bankers Bank (ACBB)
Value of common stock	$ 42

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