Loans and Allowance for Loan Losses (Past Due Status) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	$ 2,490	$ 6,588
60 - 89 days past due	2,190	1,318
More than 90 days past due	20,726	25,133
Nonaccrual	27,906	35,165
Total past due and nonaccrual	53,312	68,204
Current and accruing	1,264,805	1,144,044
Loans held for investment	1,318,117	1,212,248	[1]
Commercial and agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	98,637	72,252
Real estate - construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	75,924	64,083
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	662,460	636,107
Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	415,471	394,924
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	65,625	44,882
PC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	1,492	5,461
60 - 89 days past due	855	1,293
More than 90 days past due	577	0
Nonaccrual	27,906	35,165
Total past due and nonaccrual	30,830	41,919
Current and accruing	1,156,622	1,008,677
Loans held for investment	1,187,452	1,050,596
PC [Member] | Commercial and agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	504	18
60 - 89 days past due	0	43
More than 90 days past due	0	0
Nonaccrual	351	516
Total past due and nonaccrual	855	577
Current and accruing	89,524	60,946
Loans held for investment	90,379	61,523
PC [Member] | Real estate - construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	77	168
60 - 89 days past due	144	634
More than 90 days past due	0	0
Nonaccrual	2,878	4,677
Total past due and nonaccrual	3,099	5,479
Current and accruing	63,548	48,711
Loans held for investment	66,647	54,190
PC [Member] | Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	502	3,454
60 - 89 days past due	517	522
More than 90 days past due	107	0
Nonaccrual	8,670	11,580
Total past due and nonaccrual	9,796	15,556
Current and accruing	634,346	593,698
Loans held for investment	644,142	609,254
PC [Member] | Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	327	1,765
60 - 89 days past due	154	77
More than 90 days past due	470	0
Nonaccrual	15,913	18,380
Total past due and nonaccrual	16,864	20,222
Current and accruing	304,777	261,524
Loans held for investment	321,641	281,746
PC [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	82	56
60 - 89 days past due	40	17
More than 90 days past due	0	0
Nonaccrual	94	12
Total past due and nonaccrual	216	85
Current and accruing	64,427	43,798
Loans held for investment	64,643	43,883
PI [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	998	1,127
60 - 89 days past due	1,335	25
More than 90 days past due	20,149	25,133
Nonaccrual	0	0
Total past due and nonaccrual	22,482	26,285
Current and accruing	108,183	135,367
Loans held for investment	130,665	161,652
PI [Member] | Commercial and agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	0	35
60 - 89 days past due	0	16
More than 90 days past due	2,268	1,977
Nonaccrual	0	0
Total past due and nonaccrual	2,268	2,028
Current and accruing	5,990	8,701
Loans held for investment	8,258	10,729
PI [Member] | Real estate - construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	0	48
60 - 89 days past due	0	0
More than 90 days past due	3,934	2,758
Nonaccrual	0	0
Total past due and nonaccrual	3,934	2,806
Current and accruing	5,343	7,087
Loans held for investment	9,277	9,893
PI [Member] | Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	93	135
60 - 89 days past due	0	9
More than 90 days past due	2,352	2,907
Nonaccrual	0	0
Total past due and nonaccrual	2,445	3,051
Current and accruing	15,873	23,802
Loans held for investment	18,318	26,853
PI [Member] | Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	898	903
60 - 89 days past due	1,335	0
More than 90 days past due	11,584	17,479
Nonaccrual	0	0
Total past due and nonaccrual	13,817	18,382
Current and accruing	80,013	94,796
Loans held for investment	93,830	113,178
PI [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	7	6
60 - 89 days past due	0	0
More than 90 days past due	11	12
Nonaccrual	0	0
Total past due and nonaccrual	18	18
Current and accruing	964	981
Loans held for investment	$ 982	$ 999

[1] Derived from audited consolidated financial statements