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Loans and Allowance for Loan Losses - Summary of Risk Category of Loans by Class of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 1,196,522	$ 1,110,446
Real Estate | Construction and Land Development
Accounts Notes And Loans Receivable [Line Items]
Total loans	94,297	89,409
Real Estate | Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans	491,086	501,798
Real Estate | Single-family Residential Mortgages
Accounts Notes And Loans Receivable [Line Items]
Total loans	237,167	156,428
Commercial | Other
Accounts Notes And Loans Receivable [Line Items]
Total loans	225,967	203,843
Commercial | SBA
Accounts Notes And Loans Receivable [Line Items]
Total loans	148,005	158,968
Pass
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,141,529	1,044,172
Pass | Real Estate | Construction and Land Development
Accounts Notes And Loans Receivable [Line Items]
Total loans	94,004	87,174
Pass | Real Estate | Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans	444,108	475,499
Pass | Real Estate | Single-family Residential Mortgages
Accounts Notes And Loans Receivable [Line Items]
Total loans	237,167	136,206
Pass | Commercial | Other
Accounts Notes And Loans Receivable [Line Items]
Total loans	222,743	194,227
Pass | Commercial | SBA
Accounts Notes And Loans Receivable [Line Items]
Total loans	143,507	151,066
Special Mention
Accounts Notes And Loans Receivable [Line Items]
Total loans	7,296	22,378
Special Mention | Real Estate | Construction and Land Development
Accounts Notes And Loans Receivable [Line Items]
Total loans		1,932
Special Mention | Real Estate | Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans	4,517	4,562
Special Mention | Real Estate | Single-family Residential Mortgages
Accounts Notes And Loans Receivable [Line Items]
Total loans		13,950
Special Mention | Commercial | Other
Accounts Notes And Loans Receivable [Line Items]
Total loans	960
Special Mention | Commercial | SBA
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,819	1,934
Substandard
Accounts Notes And Loans Receivable [Line Items]
Total loans	43,747	37,763
Substandard | Real Estate | Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans	40,174	19,484
Substandard | Real Estate | Single-family Residential Mortgages
Accounts Notes And Loans Receivable [Line Items]
Total loans		6,272
Substandard | Commercial | Other
Accounts Notes And Loans Receivable [Line Items]
Total loans	971	9,616
Substandard | Commercial | SBA
Accounts Notes And Loans Receivable [Line Items]
Total loans	2,602	2,391
Impaired
Accounts Notes And Loans Receivable [Line Items]
Total loans	3,950	6,133
Impaired | Real Estate | Construction and Land Development
Accounts Notes And Loans Receivable [Line Items]
Total loans	293	303
Impaired | Real Estate | Commercial Real Estate
Accounts Notes And Loans Receivable [Line Items]
Total loans	2,287	2,253
Impaired | Commercial | Other
Accounts Notes And Loans Receivable [Line Items]
Total loans	1,293
Impaired | Commercial | SBA
Accounts Notes And Loans Receivable [Line Items]
Total loans	$ 77	$ 3,577

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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