Loans and Allowance for Loan Losses Schedule of Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	$ 356	$ 1,548
Current loans	1,246,012	1,181,542
Nonaccrual loans	1,381	1,561
Loans, gross	1,247,749	1,184,651
Commercial loan [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	39	34
Current loans	348,870	316,528
Nonaccrual loans	142	346
Loans, gross	349,051	316,908
Construction, land and land development [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Current loans	174,602	154,490
Nonaccrual loans	0	0
Loans, gross	174,602	154,490
1-4 family residential first mortgages [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	317	0
Current loans	50,721	53,240
Nonaccrual loans	332	257
Loans, gross	51,370	53,497
Home equity [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	14
Current loans	21,479	24,257
Nonaccrual loans	270	229
Loans, gross	21,749	24,500
Commercial real estate [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	1,500
Current loans	643,539	623,709
Nonaccrual loans	637	729
Loans, gross	644,176	625,938
Consumer and other loans [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Current loans	6,801	9,318
Nonaccrual loans	0	0
Loans, gross	6,801	9,318
Financing Receivables, 30 to 59 Days Past Due [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	318	1,548
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial loan [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	1	34
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction, land and land development [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | 1-4 family residential first mortgages [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	317	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Home equity [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	14
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	1,500
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer and other loans [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Financing Receivables, 60 to 89 Days Past Due [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	38	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial loan [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	38	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction, land and land development [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | 1-4 family residential first mortgages [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Home equity [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer and other loans [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial loan [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction, land and land development [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | 1-4 family residential first mortgages [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Home equity [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer and other loans [Member]
Loans, Recorded Investment, Past Due [Line Items]
Past due loans	$ 0	$ 0