Loans and Allowance for Loan Losses, Troubled Debt Restructurings (Details)	12 Months Ended
Dec. 31, 2017 USD ($) contract	Dec. 31, 2016 USD ($) contract	Dec. 31, 2015 USD ($) contract
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts \| contract	3	6	2
Pre Modification Outstanding Recorded Investment	$ 3,782,000	$ 11,084,000	$ 657,000
Post Modification Outstanding Recorded Investment net of related allowance	$ 3,756,000	$ 11,083,000	$ 522,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0	$ 0
Commercial Real Estate [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts \| contract	0	0	1
Pre Modification Outstanding Recorded Investment	$ 0	$ 0	$ 223,000
Post Modification Outstanding Recorded Investment net of related allowance	$ 0	$ 0	$ 185,000
Residential Mortgage [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts \| contract	1	0	0
Pre Modification Outstanding Recorded Investment	$ 6,000	$ 0	$ 0
Post Modification Outstanding Recorded Investment net of related allowance	$ 5,000	$ 0	$ 0
Construction and Land Development [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts \| contract	0	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post Modification Outstanding Recorded Investment net of related allowance	$ 0	$ 0	$ 0
Commercial and Industrial [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts \| contract	2	6	1
Pre Modification Outstanding Recorded Investment	$ 3,776,000	$ 11,084,000	$ 434,000
Post Modification Outstanding Recorded Investment net of related allowance	$ 3,751,000	$ 11,083,000	$ 337,000
Consumer and Other [Member]
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts \| contract	0	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post Modification Outstanding Recorded Investment net of related allowance	$ 0	$ 0	$ 0

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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=66008989&loc=SL6953676-111524

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953682-111524

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Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

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