Loans (Credit Quality Indicator) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	$ 1,113,765		$ 1,177,035	[1]
Substandard or Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans purchased in the Merger	70,000		60,600
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	913,962		952,705
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	62,956		71,786
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	136,173	[2]	151,396	[3]
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	674	[2]	1,148	[3]
Commercial and agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	77,490		79,704
Commercial and agricultural [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	67,700		69,003
Commercial and agricultural [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	3,416		3,447
Commercial and agricultural [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	6,076	[2]	6,953	[3]
Commercial and agricultural [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	298	[2]	301	[3]
Real estate - construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	57,653		58,414
Real estate - construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	41,979		40,117
Real estate - construction [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	1,817		2,031
Real estate - construction [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	13,857	[2]	16,266	[3]
Real estate - construction [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	0	[2]	0	[3]
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	520,808		553,538
Real estate - mortgage, 1-4 family residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	471,592		504,819
Real estate - mortgage, 1-4 family residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	14,785		15,855
Real estate - mortgage, 1-4 family residential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	34,431	[2]	32,625	[3]
Real estate - mortgage, 1-4 family residential [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	0	[2]	239	[3]
Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	414,995		441,836
Real estate - mortgage, commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	290,610		296,271
Real estate - mortgage, commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	42,767		50,275
Real estate - mortgage, commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	81,450	[2]	95,126	[3]
Real estate - mortgage, commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	168	[2]	164	[3]
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	42,819		43,543
Consumer [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	42,081		42,495
Consumer [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	171		178
Consumer [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	359	[2]	426	[3]
Consumer [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	$ 208	[2]	$ 444	[3]

[1] Derived from audited consolidated financial statements

[2] (dollars in thousands) Pass Special Mention Substandard Doubtful (Ratings 1-5) (Rating 6) (Rating 7) (Rating 8) TotalCommercial and agricultural $67,700 $3,416 $6,076 $298 $77,490Real estate - construction 41,979 1,817 13,857 — 57,653Real estate - mortgage: 1-4 family residential 471,592 14,785 34,431 — 520,808Commercial 290,610 42,767 81,450 168 414,995Consumer 42,081 171 359 208 42,819Total $913,962 $62,956 $136,173 $674 $1,113,765

[3] (dollars in thousands) Pass Special Mention Substandard Doubtful (Ratings 1-5) (Rating 6) (Rating 7) (Rating 8) TotalCommercial and agricultural $69,003 $3,447 $6,953 $301 $79,704Real estate - construction 40,117 2,031 16,266 — 58,414Real estate - mortgage: 1-4 family residential 504,819 15,855 32,625 239 553,538Commercial 296,271 50,275 95,126 164 441,836Consumer 42,495 178 426 444 43,543Total $952,705 $71,786 $151,396 $1,148 $1,177,035