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Investment securities - Additional Information (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2020 USD ($) shares	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2019 USD ($)
Value of common stock	$ 14,670			$ 14,777
Visa Class A stock
Conversion ratio of common stock	1.6228
Visa Class B stock
Shares held | shares	44,982
Value of common stock	$ 0			0
Federal Home Loan Bank of Pittsburgh (FHLB)
Value of common stock	10,642			10,159
Atlantic Community Bankers Bank (ACBB)
Value of common stock	$ 42			$ 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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