Loans and Allowance for Loan Losses (Past Due Status) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	$ 4,536	$ 6,588
60 - 89 days past due	647	1,318
More than 90 days past due	21,157	25,133
Nonaccrual	25,288	35,165
Total past due and nonaccrual	51,628	68,204
Current and accruing	1,306,160	1,144,044
Loans held for investment	1,357,788	1,212,248
Commercial and agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	113,413	72,252
Real estate - construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	78,327	64,083
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	667,602	636,107
Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	426,328	394,924
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	72,118	44,882
PC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	3,668	5,461
60 - 89 days past due	513	1,293
More than 90 days past due	5	0
Nonaccrual	25,288	35,165
Total past due and nonaccrual	29,474	41,919
Current and accruing	1,205,472	1,008,677
Loans held for investment	1,234,946	1,050,596
PC [Member] | Commercial and agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	0	18
60 - 89 days past due	0	43
More than 90 days past due	0	0
Nonaccrual	608	516
Total past due and nonaccrual	608	577
Current and accruing	105,269	60,946
Loans held for investment	105,877	61,523
PC [Member] | Real estate - construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	100	168
60 - 89 days past due	0	634
More than 90 days past due	0	0
Nonaccrual	2,307	4,677
Total past due and nonaccrual	2,407	5,479
Current and accruing	66,723	48,711
Loans held for investment	69,130	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	2,719	3,454
60 - 89 days past due	147	522
More than 90 days past due	0	0
Nonaccrual	8,637	11,580
Total past due and nonaccrual	11,503	15,556
Current and accruing	638,364	593,698
Loans held for investment	649,867	609,254
PC [Member] | Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	105	1,765
60 - 89 days past due	141	77
More than 90 days past due	0	0
Nonaccrual	13,381	18,380
Total past due and nonaccrual	13,627	20,222
Current and accruing	325,356	261,524
Loans held for investment	338,983	281,746
PC [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	744	56
60 - 89 days past due	225	17
More than 90 days past due	5	0
Nonaccrual	355	12
Total past due and nonaccrual	1,329	85
Current and accruing	69,760	43,798
Loans held for investment	71,089	43,883
PI [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	868	1,127
60 - 89 days past due	134	25
More than 90 days past due	21,152	25,133
Nonaccrual	0	0
Total past due and nonaccrual	22,154	26,285
Current and accruing	100,688	135,367
Loans held for investment	122,842	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	2,232	1,977
Nonaccrual	0	0
Total past due and nonaccrual	2,232	2,028
Current and accruing	5,303	8,701
Loans held for investment	7,535	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	3,737	2,758
Nonaccrual	0	0
Total past due and nonaccrual	3,737	2,806
Current and accruing	5,460	7,087
Loans held for investment	9,197	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	579	135
60 - 89 days past due	15	9
More than 90 days past due	2,209	2,907
Nonaccrual	0	0
Total past due and nonaccrual	2,803	3,051
Current and accruing	14,934	23,802
Loans held for investment	17,737	26,853
PI [Member] | Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	287	903
60 - 89 days past due	119	0
More than 90 days past due	12,964	17,479
Nonaccrual	0	0
Total past due and nonaccrual	13,370	18,382
Current and accruing	73,975	94,796
Loans held for investment	87,345	113,178
PI [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	2	6
60 - 89 days past due	0	0
More than 90 days past due	10	12
Nonaccrual	0	0
Total past due and nonaccrual	12	18
Current and accruing	1,016	981
Loans held for investment	$ 1,028	$ 999