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Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) contract	Mar. 31, 2017 USD ($) contract
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts | contract	0	1
Pre Modification Outstanding Recorded Investment	$ 0	$ 3,457
Post Modification Outstanding Recorded Investment, net of related allowance	$ 0	$ 3,457
Commercial real estate - mortgage
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts | contract	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0
Post Modification Outstanding Recorded Investment, net of related allowance	$ 0	$ 0
Consumer real estate - mortgage
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts | contract	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0
Post Modification Outstanding Recorded Investment, net of related allowance	$ 0	$ 0
Construction and land development
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts | contract	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0
Post Modification Outstanding Recorded Investment, net of related allowance	$ 0	$ 0
Commercial and industrial
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts | contract	0	1
Pre Modification Outstanding Recorded Investment	$ 0	$ 3,457
Post Modification Outstanding Recorded Investment, net of related allowance	$ 0	$ 3,457
Consumer and other
Troubled debt restructuring categorized by loan classification [Abstract]
Number of contracts | contract	0	0
Pre Modification Outstanding Recorded Investment	$ 0	$ 0
Post Modification Outstanding Recorded Investment, net of related allowance	$ 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.

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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