Loans and Allowance for Loan Losses (Credit Quality Indicator) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	$ 1,269,865,000	$ 1,212,248,000	[1]
Loans and Leases Receivable, Deferred Income	(3,500,000)	3,600,000
Servicing Assets, Unconsolidated Loans Serviced, Unpaid Principal Balance	212,600,000	190,200,000
Commercial and agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	86,332,000	72,252,000
Real estate - construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	72,024,000	64,083,000
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	660,004,000	636,107,000
Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	394,501,000	394,924,000
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	57,004,000	44,882,000
Substandard or Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans purchased in the Merger	33,900,000	40,500,000
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	1,148,979,000	1,070,830,000
Pass [Member] | Commercial and agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	81,579,000	67,277,000
Pass [Member] | Real estate - construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	61,125,000	50,138,000
Pass [Member] | Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	633,335,000	601,304,000
Pass [Member] | Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	316,326,000	307,661,000
Pass [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	56,614,000	44,450,000
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	41,108,000	45,884,000
Special Mention [Member] | Commercial and agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	1,361,000	1,262,000
Special Mention [Member] | Real estate - construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	2,930,000	3,984,000
Special Mention [Member] | Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	8,347,000	10,887,000
Special Mention [Member] | Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	28,451,000	29,711,000
Special Mention [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	19,000	40,000
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	79,470,000	95,189,000
Substandard [Member] | Commercial and agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	3,392,000	3,713,000
Substandard [Member] | Real estate - construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	7,969,000	9,961,000
Substandard [Member] | Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	18,322,000	23,916,000
Substandard [Member] | Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	49,724,000	57,552,000
Substandard [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	63,000	47,000
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	308,000	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	$ 308,000	$ 345,000

[1] Derived from audited consolidated financial statements