Loans and Allowance for Loan Losses (Evaluation for Impairment) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	$ 442		$ 927
ALL, collectively evaluated for impairment	17,160		20,298
ALL, PI loans evaluated for credit impairment	3,923		5,560
ALL, PI loans with no credit deterioration	0		0
Total ALL evaluated for impairment	21,525	23,975	26,785		25,387	25,085	29,314
Loans held for investment, individually evaluated for impairment	37,393		42,830
Loans held for investment, collectively evaluated for impairment	1,150,059		1,007,766
Loans held for investment, PI loans with subsequent credit deterioration	111,541		161,307
Loans held for investment, PI loans with no credit deterioration	19,124		345
Loans held for investment	1,318,117		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	2,940		2,549
ALL, PI loans evaluated for credit impairment	380		382
ALL, PI loans with no credit deterioration	0		0
Total ALL evaluated for impairment	3,320	3,508	2,931		2,610	2,192	3,238
Loans held for investment, individually evaluated for impairment	222		398
Loans held for investment, collectively evaluated for impairment	90,157		61,125
Loans held for investment, PI loans with subsequent credit deterioration	7,774		10,729
Loans held for investment, PI loans with no credit deterioration	484		0
Loans held for investment	98,637		72,252
Real estate - construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	0		0
ALL, collectively evaluated for impairment	3,155		4,218
ALL, PI loans evaluated for credit impairment	613		1,015
ALL, PI loans with no credit deterioration	0		0
Total ALL evaluated for impairment	3,768	4,778	5,233		5,095	5,652	4,987
Loans held for investment, individually evaluated for impairment	2,830		4,734
Loans held for investment, collectively evaluated for impairment	63,817		49,456
Loans held for investment, PI loans with subsequent credit deterioration	9,199		9,792
Loans held for investment, PI loans with no credit deterioration	78		101
Loans held for investment	75,924		64,083
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	355		927
ALL, collectively evaluated for impairment	5,625		7,218
ALL, PI loans evaluated for credit impairment	375		724
ALL, PI loans with no credit deterioration	0		0
Total ALL evaluated for impairment	6,355	7,410	8,869		8,784	7,400	8,701
Loans held for investment, individually evaluated for impairment	11,430		14,119
Loans held for investment, collectively evaluated for impairment	632,712		595,135
Loans held for investment, PI loans with subsequent credit deterioration	16,892		26,628
Loans held for investment, PI loans with no credit deterioration	1,426		225
Loans held for investment	662,460		636,107
Real estate - mortgage, commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	87		0
ALL, collectively evaluated for impairment	2,676		3,944
ALL, PI loans evaluated for credit impairment	2,365		3,251
ALL, PI loans with no credit deterioration	0		0
Total ALL evaluated for impairment	5,128	5,666	7,195		6,475	7,387	9,627
Loans held for investment, individually evaluated for impairment	22,911		23,579
Loans held for investment, collectively evaluated for impairment	298,730		258,167
Loans held for investment, PI loans with subsequent credit deterioration	76,695		113,178
Loans held for investment, PI loans with no credit deterioration	17,135		0
Loans held for investment	415,471		394,924
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
ALL, individually evaluated for impairment	0		0
ALL, collectively evaluated for impairment	2,764		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	2,954	2,613	2,557		2,423	2,454	2,761
Loans held for investment, individually evaluated for impairment	0		0
Loans held for investment, collectively evaluated for impairment	64,643		43,883
Loans held for investment, PI loans with subsequent credit deterioration	981		980
Loans held for investment, PI loans with no credit deterioration	1		19
Loans held for investment	$ 65,625		$ 44,882

[1] Derived from audited consolidated financial statements