Investment Securities (Narrative) (Details) - USD ($)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Investment in Federal Home Loan and Atlantic Central Bankers Bank stock recorded at cost	$ 1,400,000	$ 5,300,000
Pledged Assets Separately Reported, Securities Pledged for Federal Home Loan Bank, at Fair Value	0
Gross gains on sales of securities	0	0	$ 41,000
Gross losses on sales of securities	0	0	0
Other than temporary impairment charges on one trust preferred pool security	0	0	$ 0
Book value		84,387,000
Fair value		83,002,000
Federal Home Loan Bank Advances [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Investment securities pledged as collateral		262,000,000.0
Single Issuers [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Book value	10,000,000.0
Fair value	6,800,000	$ 7,152,000
Atlantic Central Bankers Bank [Member]
Debt Securities, Available-for-sale, Allowance for Credit Loss [Line Items]
Investment stock amount	$ 40,000

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This line item represents investment securities pledged to secure securities sold under repurchase agreements as required or permitted by law.

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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The fair value, as of the date of each statement of financial position presented, of securities which are owned but transferred to serve as collateral for the payment of the FHLB debt obligations, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them.

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