Loans and Allowance for Loan Losses (Credit Quality Indicator) (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	$ 1,318,117,000	$ 1,212,248,000	[1]
Loans and Leases Receivable, Deferred Income	(3,100,000)	3,600,000
Servicing Assets, Unconsolidated Loans Serviced, Unpaid Principal Balance	222,800,000	190,200,000
Commercial and agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	98,637,000	72,252,000
Real estate - construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	75,924,000	64,083,000
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	662,460,000	636,107,000
Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	415,471,000	394,924,000
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	65,625,000	44,882,000
Substandard or Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans purchased in the Merger	30,800,000	40,500,000
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	1,208,965,000	1,070,830,000
Pass [Member] | Commercial and agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	94,085,000	67,277,000
Pass [Member] | Real estate - construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	65,298,000	50,138,000
Pass [Member] | Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	637,609,000	601,304,000
Pass [Member] | Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	346,857,000	307,661,000
Pass [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	65,116,000	44,450,000
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	36,059,000	45,884,000
Special Mention [Member] | Commercial and agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	1,704,000	1,262,000
Special Mention [Member] | Real estate - construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	2,868,000	3,984,000
Special Mention [Member] | Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	8,067,000	10,887,000
Special Mention [Member] | Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	23,405,000	29,711,000
Special Mention [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	15,000	40,000
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	72,238,000	95,189,000
Substandard [Member] | Commercial and agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	2,848,000	3,713,000
Substandard [Member] | Real estate - construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	7,758,000	9,961,000
Substandard [Member] | Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	16,784,000	23,916,000
Substandard [Member] | Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	44,743,000	57,552,000
Substandard [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	105,000	47,000
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	855,000	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	466,000	0
Doubtful [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	$ 389,000	$ 345,000

[1] Derived from audited consolidated financial statements