Allowance For Loan Losses (Evaluation for Impairment) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	$ 8,724		$ 11,090
ALL, collectively evaluated for impairment	26,491		28,270
ALL, PI loans evluated for credit impairment	3,336		0
ALL, PI loans with no credit deterioration	0		0
Total ALL evaluated for impairment	38,551	39,795	39,360	59,366	68,729	93,687
Loans held for investment, individually evaluated for impairment	95,938		96,241
Loans held for investment, collectively evaluated for impairment	898,793		790,458
Loans held for investment, PI loans with subsequent credit deterioration	36,659		0
Loans held for investment, PI loans with no credit deterioration	250,433		330,836
Loans held for investment	1,281,823		1,217,535
Commercial and agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	1,208		1,506
ALL, collectively evaluated for impairment	4,105		4,270
ALL, PI loans evluated for credit impairment	1,838		0
ALL, PI loans with no credit deterioration	0		0
Total ALL evaluated for impairment	7,151	6,005	5,776	6,527	8,719	11,144
Loans held for investment, individually evaluated for impairment	3,028		3,890
Loans held for investment, collectively evaluated for impairment	55,062		62,327
Loans held for investment, PI loans with subsequent credit deterioration	18,911		0
Loans held for investment, PI loans with no credit deterioration	1,366		28,872
Loans held for investment	78,367		95,089
Real estate - construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	2,247		4,899
ALL, collectively evaluated for impairment	9,002		7,096
ALL, PI loans evluated for credit impairment	71		0
ALL, PI loans with no credit deterioration	0		0
Total ALL evaluated for impairment	11,320	10,912	11,995	28,419	32,947	46,792
Loans held for investment, individually evaluated for impairment	24,187		30,460
Loans held for investment, collectively evaluated for impairment	45,716		54,705
Loans held for investment, PI loans with subsequent credit deterioration	2,188		0
Loans held for investment, PI loans with no credit deterioration	3,485		7,641
Loans held for investment	75,576		92,806
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	2,056		2,140
ALL, collectively evaluated for impairment	6,093		6,745
ALL, PI loans evluated for credit impairment	635		0
ALL, PI loans with no credit deterioration	0		0
Total ALL evaluated for impairment	8,784	12,103	8,885	9,030	9,751	7,742
Loans held for investment, individually evaluated for impairment	20,778		24,886
Loans held for investment, collectively evaluated for impairment	523,044		375,945
Loans held for investment, PI loans with subsequent credit deterioration	3,179		0
Loans held for investment, PI loans with no credit deterioration	42,971		52,894
Loans held for investment	589,972		453,725
Real estate - mortgage, commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	3,012		2,415
ALL, collectively evaluated for impairment	5,488		8,648
ALL, PI loans evluated for credit impairment	718		0
ALL, PI loans with no credit deterioration	0		0
Total ALL evaluated for impairment	9,218	8,799	11,063	13,619	15,668	26,851
Loans held for investment, individually evaluated for impairment	47,744		36,835
Loans held for investment, collectively evaluated for impairment	232,229		254,927
Loans held for investment, PI loans with subsequent credit deterioration	12,307		0
Loans held for investment, PI loans with no credit deterioration	201,441		239,621
Loans held for investment	493,721		531,383
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	201		130
ALL, collectively evaluated for impairment	1,803		1,511
ALL, PI loans evluated for credit impairment	74		0
ALL, PI loans with no credit deterioration	0		0
Total ALL evaluated for impairment	2,078	1,976	1,641	1,771	1,644	1,158
Loans held for investment, individually evaluated for impairment	201		170
Loans held for investment, collectively evaluated for impairment	42,742		42,554
Loans held for investment, PI loans with subsequent credit deterioration	74		0
Loans held for investment, PI loans with no credit deterioration	1,170		1,808
Loans held for investment	$ 44,187		$ 44,532