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Loans and Related Allowance for Loan Losses (Narrative) (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($) contract	Sep. 30, 2018 USD ($) contract	Sep. 30, 2019 USD ($) loan contract	Sep. 30, 2018 USD ($) 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	$ 11,713,000		$ 11,713,000		$ 4,922,000
Financing receivable, modifications, number of contracts | loan			14		16
Financing receivable, modifications, recorded investment	4,100,000		$ 4,100,000		$ 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			0.67%		1.09%
Partial Charge Off [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	$ 100,000		$ 100,000		$ 300,000
New TDR [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	1	0	1	0
Foreclosure 1-4 Family Real Estate Properties [Member]
Financing Receivable, Modifications [Line Items]
Loans secured by real estate properties in process of foreclosure	$ 300,000		$ 300,000		300,000
Pre Existing TDR [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0	1	2	3
Financing receivable, modifications, subsequent default, recorded investment	$ 0	$ 0	$ 0	$ 0
Acquisition and Development (A&D) TDR [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	1,900,000		1,900,000
Increase in non-accrual status			7,700,000
Substandard [Member] | Acquisition and Development (A&D) TDR [Member]
Financing Receivable, Modifications [Line Items]
Increase in non-accrual status			8,000,000
Commercial real estate- non owner-occupied [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	33,000		33,000		$ 173,000
Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	$ 27,000		$ 27,000

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