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Loans and Related Allowance for Loan Losses (Narrative) (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) contract	Jun. 30, 2016 USD ($) contract	Jun. 30, 2017 USD ($) contract	Jun. 30, 2016 USD ($) contract	Dec. 31, 2016 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
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	$ 9,472,000		9,472,000		$ 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		$ 486		$ 2,873
Loans in process of foreclosure	300,000		$ 300,000		$ 500,000
Accruing loans past due 30 days or greater as percent of loan portfolio			0.68%		0.67%
Total allowance for loan losses	9,922,000	$ 12,678,000	$ 9,922,000	$ 12,678,000	$ 9,918,000	$ 11,583,000	$ 12,256,000	$ 11,922,000
Partial Charge Off [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	$ 5,500,000		$ 5,500,000		11,100,000
New TDR [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	1	0	3
Pre Existing TDR Loans Remodified After Maturity [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0		2	1
Commercial real estate- non owner-occupied [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	$ 5,000,000		$ 5,000,000		6,381,000
Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	0		0		0
Total allowance for loan losses	$ 836,000	$ 737,000	$ 836,000	$ 737,000	$ 858,000	$ 936,000	$ 758,000	$ 722,000

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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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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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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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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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