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Investment securities - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($) shares	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) shares	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Value of common stock	$ 14,468		$ 14,468		$ 14,777
Other-than-temporary impairments recognized			$ 0
Visa Class A stock
Conversion ratio of common stock			1.6228
Visa Class B stock
Value of common stock	$ 0		$ 0		0
Shares held | shares	44,982		44,982
Federal Home Loan Bank of Pittsburgh (FHLB)
Value of common stock	$ 5,503		$ 5,503		10,159
Atlantic Community Bankers Bank (ACBB)
Value of common stock	42		42		$ 42
U.S. government-sponsored enterprises state and municipals
Other-than-temporary impairments recognized	$ 0	$ 0	$ 0	$ 0
Maximum percentage of stockholders' equity exceeded for securities of any individual issuer			10.00%		10.00%

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