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Loans and Related Allowance for Loan Losses (Narrative) (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($) contract	Sep. 30, 2016 USD ($) contract	Sep. 30, 2017 USD ($) contract	Sep. 30, 2016 USD ($) contract	Dec. 31, 2016 USD ($)
Financing Receivable, Modifications [Line Items]
Commercial amount benchmark minimum for internal annual review			$ 500,000
Commercial amount benchmark minimum for annual review by independent reviewer			1,000,000
Commercial amount benchmark minimum criticized relationships for annual review by independent reviewer			500,000
Nonaccrual loans	$ 11,643,000		11,643,000		$ 13,946,000
Decrease in non-accrual balance due to charge-offs			2,900,000
Decrease in non-accrual balance due to movement to OREO			800,000
Redution in ALL due to change in impairment evaluation method		$ 468		$ 3,341
Loans in process of foreclosure	500,000		$ 500,000		$ 500,000
Accruing loans past due 30 days or greater as percent of loan portfolio			0.72%		0.67%
Partial Charge Off [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	$ 5,600,000		$ 5,600,000		$ 11,100,000
New TDR [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	1	0	4
Pre Existing TDR Loans Remodified After Maturity [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	1		3	3
Commercial real estate- non owner-occupied [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	$ 6,535,000		$ 6,535,000		6,381,000
Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	$ 412,000		$ 412,000		$ 0

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Commercial amount benchmark minimum criticized relationships for annual review by independent reviewer.

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Commerical amount benchmark minimum for annual review by independent reviewer.

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Represents the decrease in non-accrual balance of loans as the result of movement to other real estate owned (OREO)

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Amount of other addition (reduction) in allowance reserve for credit loss.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5212-111524

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

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Percent of financing receivables past due.

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Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

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Reflects the amount of the write-down related to a troubled debt restructuring.

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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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