Loans and Allowance for Loan Losses (Credit Quality Indicator) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	$ 1,219,785,000	$ 1,212,248,000	[1]
Loans and Leases Receivable, Deferred Income	(3,300,000)	3,600,000
Servicing Assets, Unconsolidated Loans Serviced, Unpaid Principal Balance	201,500,000	190,200,000
Commercial and agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	75,978,000	72,252,000
Real estate - construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	67,304,000	64,083,000
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	631,774,000	636,107,000
Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	396,110,000	394,924,000
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	48,619,000	44,882,000
Substandard or Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans purchased in the Merger	38,700,000	40,500,000
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	1,085,718,000	1,070,830,000
Pass [Member] | Commercial and agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	70,782,000	67,277,000
Pass [Member] | Real estate - construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	54,331,000	50,138,000
Pass [Member] | Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	601,449,000	601,304,000
Pass [Member] | Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	310,951,000	307,661,000
Pass [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	48,205,000	44,450,000
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	43,194,000	45,884,000
Special Mention [Member] | Commercial and agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	1,180,000	1,262,000
Special Mention [Member] | Real estate - construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	3,275,000	3,984,000
Special Mention [Member] | Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	9,234,000	10,887,000
Special Mention [Member] | Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	29,466,000	29,711,000
Special Mention [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	39,000	40,000
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	90,564,000	95,189,000
Substandard [Member] | Commercial and agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	4,016,000	3,713,000
Substandard [Member] | Real estate - construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	9,698,000	9,961,000
Substandard [Member] | Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	21,091,000	23,916,000
Substandard [Member] | Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	55,693,000	57,552,000
Substandard [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	66,000	47,000
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	309,000	345,000
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	$ 309,000	$ 345,000

[1] Derived from audited consolidated financial statements