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Loans, Allowance For Loan Losses And OREO (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($) contract item	Sep. 30, 2017 contract	Sep. 30, 2018 USD ($) contract item	Sep. 30, 2017 contract	Dec. 31, 2017 USD ($) contract item	Dec. 31, 2016 USD ($)
Financing Receivable, Modifications [Line Items]
Other real estate owned | $	$ 2,455		$ 2,455		$ 2,650	$ 2,370
Loan modifications that would have been classified as TDRs | contract	0	0	0	0
Loan modifications classified as TDRs | contract	0	0	0	0
Outstanding commitments to disburse additional funds on TDR's | contract			0		0
Consumer mortgage loan secured by residential real estate | $	$ 0		$ 0		$ 0
Number of real estate properties held | item	4		4		3
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Other real estate owned | $	$ 180		$ 180		$ 520

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Outstanding commitments to disburse additional funds on TDR's

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Number of financing receivables that have been modified by troubled debt restructurings.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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The number of real estate properties owned as of the balance sheet date.

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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