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Loans and Related Allowance for Loan Losses (Narrative) (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($) contract	Jun. 30, 2018 USD ($) contract	Jun. 30, 2019 USD ($) loan contract	Jun. 30, 2018 USD ($) contract	Dec. 31, 2018 USD ($) loan
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	$ 13,118,000		$ 13,118,000		$ 4,922,000
Financing receivable, modifications, number of contracts | loan			13		16
Financing receivable, modifications, recorded investment	4,000,000		$ 4,000,000		$ 4,900,000
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Modifications [Line Items]
Decrease in percentage of accruing loans past due 30 days or more			0.46%		1.09%
Partial Charge Off [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	$ 200,000		$ 200,000		$ 300,000
New TDR [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	0	0	0
Foreclosure 1-4 Family Real Estate Properties [Member]
Financing Receivable, Modifications [Line Items]
Loans secured by real estate properties in process of foreclosure	$ 200,000		$ 200,000		300,000
Pre Existing TDR [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	2	2	2
Financing receivable, modifications, recorded investment		$ 0		$ 0
Financing receivable, modifications, subsequent default, recorded investment	$ 0		$ 0
Acquisition and Development (A&D) TDR [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	1,700,000		1,700,000
Increase in non-accrual status			7,000,000
Commercial real estate- non owner-occupied [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	133,000		133,000		$ 173,000
Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	$ 27,000		$ 27,000

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