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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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