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Investment securities - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) shares	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) security shares	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Other-than-temporary impairments recognized			$ 0
Value of common stock	$ 14,407		$ 14,407		$ 14,431
Visa Class A stock
Conversion ratio of common stock			1.6228
Visa Class B stock
Shares held | shares	44,982		44,982
Value of common stock	$ 0		$ 0		0
Federal Home Loan Bank of Pittsburgh (FHLB)
Value of common stock	3,083		3,083		5,355
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
Mortgage-backed Securities, U.S. government-sponsored enterprises
Number of securities in continuous unrealized loss position | security			14
Number of securities in continuous unrealized loss positions 12 months or longer | security			2
State and Municipals, Taxable
Number of securities in continuous unrealized loss position | security			25
State and Municipals, Taxable | Corporate Bonds
Number of securities in continuous unrealized loss position | security			5
State and Municipals, Tax-exempt
Number of securities in continuous unrealized loss position | security			44

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