Loans and Allowance for Loan Losses (Evaluation for Impairment) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	$ 855		$ 927
ALL, collectively evaluated for impairment	18,997		20,298
ALL, PI loans evaluated for credit impairment	4,123		5,560
ALL, PI loans with no credit deterioration			0
Total ALL evaluated for impairment	23,975	26,039	26,785		25,085	29,641	29,314
Loans held for investment, individually evaluated for impairment	39,595		42,830
Loans held for investment, collectively evaluated for impairment	1,088,346		1,007,766
Loans held for investment, PI loans with subsequent credit deterioration	141,924		161,307
Loans held for investment, PI loans with no credit deterioration			345
Loans held for investment	1,269,865		1,212,248	[1]
Commercial and agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	0		0
ALL, collectively evaluated for impairment	2,927		2,549
ALL, PI loans evaluated for credit impairment	581		382
ALL, PI loans with no credit deterioration			0
Total ALL evaluated for impairment	3,508	3,441	2,931		2,192	3,373	3,238
Loans held for investment, individually evaluated for impairment	242		398
Loans held for investment, collectively evaluated for impairment	77,066		61,125
Loans held for investment, PI loans with subsequent credit deterioration	9,024		10,729
Loans held for investment, PI loans with no credit deterioration			0
Loans held for investment	86,332		72,252
Real estate - construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	280		0
ALL, collectively evaluated for impairment	3,769		4,218
ALL, PI loans evaluated for credit impairment	729		1,015
ALL, PI loans with no credit deterioration			0
Total ALL evaluated for impairment	4,778	5,308	5,233		5,652	5,594	4,987
Loans held for investment, individually evaluated for impairment	2,726		4,734
Loans held for investment, collectively evaluated for impairment	58,861		49,456
Loans held for investment, PI loans with subsequent credit deterioration	10,437		9,792
Loans held for investment, PI loans with no credit deterioration			101
Loans held for investment	72,024		64,083
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	452		927
ALL, collectively evaluated for impairment	6,547		7,218
ALL, PI loans evaluated for credit impairment	411		724
ALL, PI loans with no credit deterioration			0
Total ALL evaluated for impairment	7,410	7,923	8,869		7,400	8,803	8,701
Loans held for investment, individually evaluated for impairment	11,929		14,119
Loans held for investment, collectively evaluated for impairment	628,547		595,135
Loans held for investment, PI loans with subsequent credit deterioration	19,528		26,628
Loans held for investment, PI loans with no credit deterioration			225
Loans held for investment	660,004		636,107
Real estate - mortgage, commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	123		0
ALL, collectively evaluated for impairment	3,331		3,944
ALL, PI loans evaluated for credit impairment	2,212		3,251
ALL, PI loans with no credit deterioration			0
Total ALL evaluated for impairment	5,666	6,966	7,195		7,387	9,291	9,627
Loans held for investment, individually evaluated for impairment	24,698		23,579
Loans held for investment, collectively evaluated for impairment	267,956		258,167
Loans held for investment, PI loans with subsequent credit deterioration	101,847		113,178
Loans held for investment, PI loans with no credit deterioration			0
Loans held for investment	394,501		394,924
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	0		0
ALL, collectively evaluated for impairment	2,423		2,369
ALL, PI loans evaluated for credit impairment	190		188
ALL, PI loans with no credit deterioration			0
Total ALL evaluated for impairment	2,613	2,401	2,557		2,454	2,580	2,761
Loans held for investment, individually evaluated for impairment	0		0
Loans held for investment, collectively evaluated for impairment	55,916		43,883
Loans held for investment, PI loans with subsequent credit deterioration	1,088		980
Loans held for investment, PI loans with no credit deterioration			19
Loans held for investment	$ 57,004		$ 44,882

[1] Derived from audited consolidated financial statements