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Contingent Liabilities (Narrative) (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 01, 2009 | Nov. 30, 2016 item | Jul. 31, 2015 item | Sep. 30, 2013 item | Dec. 31, 2005 item | Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($)
Contingent Liabilities [Line Items] |  |  |  |  |  |  |
Total expense | $ |  |  |  |  |  | $ 2,316 |
Rental expense | $ |  |  |  |  |  | $ 675 | $ 692
Banking Facility [Member] |  |  |  |  |  |  |
Contingent Liabilities [Line Items] |  |  |  |  |  |  |
Number of leases |  |  |  |  |  | 6 |
Commercial Loan Production Office [Member] |  |  |  |  |  |  |
Contingent Liabilities [Line Items] |  |  |  |  |  |  |
Number of leases |  |  |  |  |  | 1 |
615 Church Street [Member] |  |  |  |  |  |  |
Contingent Liabilities [Line Items] |  |  |  |  |  |  |
Period of lease | 10 years |  |  |  |  |  |
Remaining period on lease (in years) | 6 months |  |  |  |  |  |
828 Main Street [Member] |  |  |  |  |  |  |
Contingent Liabilities [Line Items] |  |  |  |  |  |  |
Period of lease |  |  |  |  |  | 10 years |
Number of renewals |  |  |  |  |  | 2 |
Period of renewal (in years) |  |  |  |  |  | 5 years |
Period of lease after of renewal options (in years) |  |  |  |  |  | 20 years |
Remaining period on lease (in years) |  |  |  |  |  | 5 years 6 months |
Total expense | $ |  |  |  |  |  | $ 1,311 |
4935 Boonsboro Road [Member] |  |  |  |  |  |  |
Contingent Liabilities [Line Items] |  |  |  |  |  |  |
Period of lease |  |  |  |  | 5 years |  |
Number of renewals |  |  |  |  | 2 |  |
Period of lease after of renewal options (in years) |  |  |  |  | 15 years |  |
Remaining period on lease (in years) |  |  |  |  | 2 years |  |
1430 Rolkin Court [Member] |  |  |  |  |  |  |
Contingent Liabilities [Line Items] |  |  |  |  |  |  |
Period of lease |  |  |  | 5 years |  |  |
Number of renewals |  |  |  | 1 |  |  |
Period of lease after of renewal options (in years) |  |  |  | 10 years |  |  |
225 Merchant Walk Avenue [Member] |  |  |  |  |  |  |
Contingent Liabilities [Line Items] |  |  |  |  |  |  |
Period of lease |  |  | 10 years |  |  |  |
Number of renewals |  |  | 2 |  |  |  |
Period of renewal (in years) |  |  | 5 years |  |  |  |
Period of lease after of renewal options (in years) |  |  | 20 years |  |  |  |
Remaining period on lease (in years) |  |  | 18 years |  |  |  |
Number of option periods |  |  | 2 |  |  |  |
3562 Electric Road [Member] |  |  |  |  |  |  |
Contingent Liabilities [Line Items] |  |  |  |  |  |  |
Period of lease |  | 5 years |  |  |  |  |
Number of renewals |  | 2 |  |  |  |  |
Period of renewal (in years) |  | 5 years |  |  |  |  |
Period of lease after of renewal options (in years) |  | 15 years |  |  |  |  |
Remaining period on lease (in years) |  | 13 years |  |  |  |  |
Number of option periods |  | 2 |  |  |  |  |
2001 South Main Street, Unit #107 [Member] |  |  |  |  |  |  |
Contingent Liabilities [Line Items] |  |  |  |  |  |  |
Period of lease |  |  |  |  |  | 3 years |
Number of renewals |  |  |  |  |  | 0 |
Remaining period on lease (in years) |  |  |  |  |  | 2 years |

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