Investment Securities (Narrative) (Details) $ in Thousands	9 Months Ended
Sep. 30, 2018 USD ($) security	Dec. 31, 2017 USD ($)
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Investment in Federal Home Loan and Atlantic Central Bankers Bank stock recorded at cost	$ 1,100	$ 991
Amortized cost of securities	84,433	86,380
Federal Home Loan Bank Advances [Member]
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Investment securities pledged to secure a line of credit with the FHLB and a letter of credit with that institution, fair value	722	310,900
Federal Reserve Bank Advances [Member]
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Investment securities pledged to secure a line of credit with the FHLB and a letter of credit with that institution, fair value	$ 170,300	225,600
Held-to-maturity [Member]
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Number of securities secured by diversified portfolios of corporate securities \| security	3
Single Issuers [Member]
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Number of single issuer trust preferred securities \| security	1
Amortized cost of securities	$ 9,155	11,031
Pooled [Member]
Schedule of Available for Sale Securities and Held to Maturity Securities [Line Items]
Amortized cost of securities	$ 75,278	$ 75,349

Number Of Securities Secured By Diversified Portfolios Of Corporate Securities

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This line item represents number of single issuer trust preferred securities held by entity that had unrealized losses during period.

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- Definition

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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 325
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=75031641&loc=d3e63345-112809

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Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728

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