Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details) - Troubled Debt Restructurings [Member] $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018 USD ($) contract	Sep. 30, 2017 USD ($) contract	Sep. 30, 2018 USD ($) contract	Sep. 30, 2017 USD ($) contract
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts \| contract	2	1	3	4
Pre Modification Outstanding Recorded Investment	$ 517	$ 501	$ 554	$ 2,479
Post Modification Outstanding Recorded Investment, net of related allowance	$ 517	$ 145	$ 554	$ 1,778
Commercial real estate - mortgage
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts \| contract	0	0	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post Modification Outstanding Recorded Investment, net of related allowance	$ 0	$ 0	$ 0	$ 0
Consumer real estate - mortgage
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts \| contract	1	0	2	1
Pre Modification Outstanding Recorded Investment	$ 169	$ 0	$ 206	$ 7
Post Modification Outstanding Recorded Investment, net of related allowance	$ 169	$ 0	$ 206	$ 5
Construction and land development
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts \| contract	1	0	1	0
Pre Modification Outstanding Recorded Investment	$ 348	$ 0	$ 348	$ 0
Post Modification Outstanding Recorded Investment, net of related allowance	$ 348	$ 0	$ 348	$ 0
Commercial and industrial
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts \| contract	0	1	0	3
Pre Modification Outstanding Recorded Investment	$ 0	$ 501	$ 0	$ 2,472
Post Modification Outstanding Recorded Investment, net of related allowance	$ 0	$ 145	$ 0	$ 1,773
Consumer and other
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts \| contract	0	0	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Post Modification Outstanding Recorded Investment, net of related allowance	$ 0	$ 0	$ 0	$ 0

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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