Loans and Allowance for Loan Losses (Evaluation for Impairment) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013		Mar. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	$ 1,119	$ 927
ALL, collectively evaluated for impairment	19,683	20,298
ALL, PI loans evaluated for credit impairment	5,237	5,560
ALL, PI loans with no credit deterioration	0	0
Total ALL evaluated for impairment	26,039	26,785		29,641	29,314
Loans held for investment, individually evaluated for impairment	41,443	42,830
Loans held for investment, collectively evaluated for impairment	1,029,309	1,007,767
Loans held for investment, PI loans with subsequent credit deterioration	138,789	161,307
Loans held for investment, PI loans with no credit deterioration	10,244	344
Loans held for investment	1,219,785	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	2,803	2,549
ALL, PI loans evaluated for credit impairment	638	382
ALL, PI loans with no credit deterioration	0	0
Total ALL evaluated for impairment	3,441	2,931		3,373	3,238
Loans held for investment, individually evaluated for impairment	242	398
Loans held for investment, collectively evaluated for impairment	66,014	61,125
Loans held for investment, PI loans with subsequent credit deterioration	5,425	10,729
Loans held for investment, PI loans with no credit deterioration	4,297	0
Loans held for investment	75,978	72,252
Real estate - construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	73	0
ALL, collectively evaluated for impairment	4,087	4,218
ALL, PI loans evaluated for credit impairment	1,148	1,015
ALL, PI loans with no credit deterioration	0	0
Total ALL evaluated for impairment	5,308	5,233		5,594	4,987
Loans held for investment, individually evaluated for impairment	3,326	4,734
Loans held for investment, collectively evaluated for impairment	52,778	49,457
Loans held for investment, PI loans with subsequent credit deterioration	9,946	9,792
Loans held for investment, PI loans with no credit deterioration	1,254	100
Loans held for investment	67,304	64,083
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	561	927
ALL, collectively evaluated for impairment	6,972	7,218
ALL, PI loans evaluated for credit impairment	390	724
ALL, PI loans with no credit deterioration	0	0
Total ALL evaluated for impairment	7,923	8,869		8,803	8,701
Loans held for investment, individually evaluated for impairment	12,997	14,119
Loans held for investment, collectively evaluated for impairment	598,378	595,135
Loans held for investment, PI loans with subsequent credit deterioration	16,031	26,628
Loans held for investment, PI loans with no credit deterioration	4,368	225
Loans held for investment	631,774	636,107
Real estate - mortgage, commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	485	0
ALL, collectively evaluated for impairment	3,610	3,944
ALL, PI loans evaluated for credit impairment	2,871	3,251
ALL, PI loans with no credit deterioration	0	0
Total ALL evaluated for impairment	6,966	7,195		9,291	9,627
Loans held for investment, individually evaluated for impairment	24,878	23,579
Loans held for investment, collectively evaluated for impairment	264,680	258,167
Loans held for investment, PI loans with subsequent credit deterioration	106,248	113,178
Loans held for investment, PI loans with no credit deterioration	304	0
Loans held for investment	396,110	394,924
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	0	0
ALL, collectively evaluated for impairment	2,211	2,369
ALL, PI loans evaluated for credit impairment	190	188
ALL, PI loans with no credit deterioration	0	0
Total ALL evaluated for impairment	2,401	2,557		2,580	2,761
Loans held for investment, individually evaluated for impairment	0	0
Loans held for investment, collectively evaluated for impairment	47,459	43,883
Loans held for investment, PI loans with subsequent credit deterioration	1,139	980
Loans held for investment, PI loans with no credit deterioration	21	19
Loans held for investment	$ 48,619	$ 44,882

[1] Derived from audited consolidated financial statements