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Allowance for Loan Losses (Narrative) (Details) $ in Thousands	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan
Financing Receivable, Recorded Investment [Line Items]
Credit Quality Loans And Leases Receivable Gross Carrying Amount	$ 559,051	$ 504,448
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Quality Loans And Leases Receivable Gross Carrying Amount	$ 8,351	$ 9,506
Consumer Installment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Credit Quality Loans And Leases Receivables Number Of Loans | loan	3	1
Credit Quality Loans And Leases Receivable Gross Carrying Amount	$ 13	$ 5

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