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Loans and Related Allowance for Loan Losses (Narrative) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) loan contract	Dec. 31, 2018 USD ($) 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
Increase in non-accrual status	$ 7,000,000
Percentage of loan portfolio	0.46%	1.09%
Nonaccrual loans	$ 11,563,000	$ 4,922,000
Financing receivable, modifications, number of contracts | loan	14	16
Financing receivable, modifications, recorded investment	$ 4,200,000	$ 4,900,000
Partial Charge Off [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	$ 200,000	300,000
New TDR [Member]
Financing Receivable, Modifications [Line Items]
Financing receivable, modifications, number of contracts | contract	0
Foreclosure 1-4 Family Real Estate Properties [Member]
Financing Receivable, Modifications [Line Items]
Loans secured by real estate properties in process of foreclosure	$ 100,000	300,000
Commercial real estate- non owner-occupied [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	144,000	173,000
Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	$ 27,000	$ 0

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- Definition

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

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Commercial amount benchmark minimum for internal annual review.

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Commercial amount benchmark minimum for annual review by independent reviewer.

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Increase in recorded investment in financing receivables that are on nonaccrual status during the reporting period.

+ References

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Represents the percentage of loan portfolio.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 7
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Reflects the aggregate value of loans, trade receivables, securities and financial instruments that serve as collateral for obligations arising from a transfer of financial assets recorded as a secured borrowing.

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-Publisher FASB
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-Topic 310
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-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524

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-Name Accounting Standards Codification
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-Section 50
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