Loans (Credit Quality Indicator) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	$ 1,231,795		$ 1,217,535
Substandard or Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans purchased in the Merger	70,000		63,600
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	979,993		910,650
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	81,616		130,677
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	169,508	[1]	174,795	[2]
Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	678	[1]	1,413	[2]
Commercial and agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	72,669		95,089
Commercial and agricultural [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	60,547		77,305
Commercial and agricultural [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	3,964		7,373
Commercial and agricultural [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	8,154	[1]	9,921	[2]
Commercial and agricultural [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	4	[1]	490	[2]
Real estate - construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	61,263		92,806
Real estate - construction [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	38,622		53,105
Real estate - construction [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	1,944		5,797
Real estate - construction [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	20,697	[1]	33,886	[2]
Real estate - construction [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	0	[1]	18	[2]
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	590,251		453,725
Real estate - mortgage, 1-4 family residential [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	534,269		385,022
Real estate - mortgage, 1-4 family residential [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	17,873		25,864
Real estate - mortgage, 1-4 family residential [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	37,844	[1]	42,630	[2]
Real estate - mortgage, 1-4 family residential [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	265	[1]	209	[2]
Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	463,173		531,383
Real estate - mortgage, commercial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	302,943		351,731
Real estate - mortgage, commercial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	57,647		91,364
Real estate - mortgage, commercial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	102,439	[1]	87,971	[2]
Real estate - mortgage, commercial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	144	[1]	317	[2]
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	44,439		44,532
Consumer [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	43,612		43,487
Consumer [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	188		279
Consumer [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	374	[1]	387	[2]
Consumer [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans held for investment	$ 265	[1]	$ 379	[2]

[1] (dollars in thousands) Pass Special Mention Substandard Doubtful (Ratings 1-5) (Rating 6) (Rating 7) (Rating 8) TotalCommercial and agricultural $60,547 $3,964 $8,154 $4 $72,669Real estate - construction 38,622 1,944 20,697 — 61,263Real estate - mortgage: 1-4 family residential 534,269 17,873 37,844 265 590,251Commercial 302,943 57,647 102,439 144 463,173Consumer 43,612 188 374 265 44,439Total $979,993 $81,616 $169,508 $678 $1,231,795

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