Loans and Allowance for Loan Losses (Loans Held for Investment) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	$ 1,524,406	$ 1,543,795	[1]
Commercial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	155,020	152,306
Real estate - Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	103,002	107,002
Real Estate - Mortgage, 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	651,770	687,554
Real estate - Mortgage, Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	497,972	489,113
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	116,642	107,820
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	1,458,488	1,476,386
Pass [Member] | Commercial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	151,873	148,844
Pass [Member] | Real estate - Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	96,350	100,252
Pass [Member] | Real Estate - Mortgage, 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	633,530	669,695
Pass [Member] | Real estate - Mortgage, Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	461,100	450,587
Pass [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	115,635	107,008
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	17,003	19,071
Special Mention [Member] | Commercial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	570	672
Special Mention [Member] | Real estate - Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	2,639	2,122
Special Mention [Member] | Real Estate - Mortgage, 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	2,900	3,508
Special Mention [Member] | Real estate - Mortgage, Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	10,889	12,765
Special Mention [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	5	4
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	48,481	48,083
Substandard [Member] | Commercial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	2,577	2,790
Substandard [Member] | Real estate - Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	4,013	4,628
Substandard [Member] | Real Estate - Mortgage, 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	15,340	14,351
Substandard [Member] | Real estate - Mortgage, Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	25,983	25,761
Substandard [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	568	553
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	434	255
Doubtful [Member] | Commercial and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	0	0
Doubtful [Member] | Real estate - Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	0	0
Doubtful [Member] | Real Estate - Mortgage, 1-4 Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	0	0
Doubtful [Member] | Real estate - Mortgage, Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	0	0
Doubtful [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	$ 434	$ 255

[1] Derived from audited consolidated financial statements