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Investment securities - Additional Information (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 08, 2021 USD ($) shares | Oct. 31, 2021 shares | Mar. 31, 2008 shares | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) security | Sep. 30, 2020 USD ($) | Dec. 31, 2008 shares | Dec. 31, 2020 USD ($)
Other-than-temporary impairments recognized |  |  |  |  |  | $ 0 |  |  |
Value of common stock |  |  |  | $ 14,356,000 |  | 14,356,000 |  |  | $ 14,431,000
Gain on sale of investments |  |  |  |  |  |  | $ 724,000 |  |
Visa Class B stock |  |  |  |  |  |  |  |  |
Value of common stock |  |  |  | 0 |  | 0 |  |  | 0
Number of shares sold | shares | 44,982 | 44,982 |  |  |  |  |  |  |
Purchase price | $ 12,200,000 |  |  |  |  |  |  |  |
Carrying value | $ 0 |  |  |  |  |  |  |  |
Number of shares purchased | shares |  |  | 73,333 |  |  |  |  |  |
Number of shares redeemed | shares |  |  |  |  |  |  |  | 28,351 |
Gain on sale of investments |  |  |  |  |  | 9,600,000 |  |  |
Federal Home Loan Bank of Pittsburgh (FHLB) |  |  |  |  |  |  |  |  |
Value of common stock |  |  |  | 3,874,000 |  | 3,874,000 |  |  | 5,355,000
Atlantic Community Bankers Bank (ACBB) |  |  |  |  |  |  |  |  |
Value of common stock |  |  |  | 42,000 |  | 42,000 |  |  | $ 42,000
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 |  |  |  |  |  | 20 |  |  |
Number of securities in continuous unrealized loss positions 12 months or longer | security |  |  |  |  |  | 4 |  |  |
Corporate Bonds |  |  |  |  |  |  |  |  |
Number of securities in continuous unrealized loss position | security |  |  |  |  |  | 5 |  |  |
State and Municipals, Taxable |  |  |  |  |  |  |  |  |
Number of securities in continuous unrealized loss position | security |  |  |  |  |  | 33 |  |  |
Number of securities in continuous unrealized loss positions 12 months or longer | security |  |  |  |  |  | 4 |  |  |
State and Municipals, Tax-exempt |  |  |  |  |  |  |  |  |
Number of securities in continuous unrealized loss position | security |  |  |  |  |  | 65 |  |  |

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