Fair Value Measurements (Fair Value, by Balance Sheet Grouping) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and due from banks, Carrying Amount	$ 11,967	$ 19,078	$ 12,259
Cash and due from banks, Fair Value	11,967	19,078
Interest-bearing deposits in banks, Carrying Amount	34,322	32,307	17,943
Interest-bearing deposits in banks, Fair Value	34,322	32,307
Securities available for sale	152,518	165,790	206,912
Investment securities available for sale, Fair Value	152,518	165,790
Held-to-maturity Securities	61,262	50,159	10,028
Investment securities held to maturity, Fair Value	61,743	50,980
Loans held for sale, Carrying Amount	2,842	6,687	2,181
Loans held for sale, Fair Value	2,842	6,687
Loans, less allowance for loan losses, Carrying Amount	688,330	691,311	687,866
Loans, less allowance for loan losses, Fair Value	718,915	724,982
Accrued interest receivable, Carrying Amount	3,416	3,360
Accrued interest receivable, Fair Value	3,416	3,360
Restricted investment in bank stocks, Carrying Amount	4,766	5,318	6,804
Restricted investment in bank stocks, Fair Value	4,766	5,318
Deposits, Carrying Amount	831,586	834,176	787,957
Deposits, Fair Value	832,626	835,640
Short-term borrowings, Carrying Amount	42,269	47,303	44,420
Short-term borrowings, Fair Value	42,269	47,303
Long-term borrowings, Carrying Amount	52,892	59,954	80,133
Long-term borrowings, Fair Value	55,014	62,296
Accrued interest payable, Carrying Amount	823	1,114
Accrued interest payable, Fair Value	823	1,114
Off-balance sheet financial instruments, Carrying Amount	—	—
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and due from banks, Fair Value	5,048	5,832
Interest-bearing deposits in banks, Fair Value	34,322	32,307
Investment securities available for sale, Fair Value	1,940	1,876
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and due from banks, Fair Value	6,919	13,246
Investment securities available for sale, Fair Value	150,578	163,914
Investment securities held to maturity, Fair Value	61,743	50,980
Loans held for sale, Fair Value	2,842	6,687
Accrued interest receivable, Fair Value	3,416	3,360
Restricted investment in bank stocks, Fair Value	4,766	5,318
Deposits, Fair Value	832,626	835,640
Short-term borrowings, Fair Value	42,269	47,303
Long-term borrowings, Fair Value	55,014	62,296
Accrued interest payable, Fair Value	823	1,114
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, less allowance for loan losses, Fair Value	$ 718,915	$ 724,982

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Interest-bearing Deposits in Banks and Other Financial Institutions, Fair Value Disclosure

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Equity interest in Federal Home Loan Bank stock, Federal Reserve Bank stock, and Atlantic Central Bankers Bank stock. 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 and equity securities categorized neither as held-to-maturity nor trading.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Description of financial instruments, excluding certain derivatives, with off-balance sheet credit risk (for example, standby letters of credit or financial guarantees), including (1) information about the (shared) activity, region or economic characteristic that identifies the concentration, (2) the face or contract amount of the instrument, (3) the nature and terms of the instrument, including the market risk, cash requirements and accounting policies for it, (4) the maximum amount of loss due to credit risk that would be incurred if the counterparties failed completely to perform according to the terms of the contracts, and any security or collateral that proved to be of no value, (5) the entity's policy of requiring collateral or other security to support financial instruments subject to credit risk, information about access to collateral or other security, and a brief description of the security supporting those financial instruments, and (6) the policy of entering into and a brief description of master netting arrangements to mitigate the credit risk, and the extent to which such arrangements would reduce the maximum amount of loss due to credit risk.

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