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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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The carrying value of investment owned.

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Number of investment owned shares purchased.

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Number of investment owned shares redeemed.

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The number of investment owned shares sold.

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The amount of consideration for sale of investment owned shares.

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The number of securities in continuous unrealized loss position.

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Number of securities in continuous unrealized loss position for more than 12 months.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale.

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Amount, before tax, of other-than-temporary impairment (OTTI) on investment in debt security measured at amortized cost (held-to-maturity), recognized in earnings and other comprehensive income (OCI).

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