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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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