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Investment securities - Additional Information (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)
Value of common stock	$ 14,798	$ 14,798
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	$ 8,384	$ 7,420
Atlantic Community Bankers Bank (ACBB)
Value of common stock	$ 42
U.S. Government-sponsored enterprises state and municipals
Maximum percentage of stockholders' equity exceeded for securities of any individual issuer	10.00%	10.00%

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