Loans and Allowance for Loan Losses (Past Due Status) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	$ 6,588	$ 11,443
60 - 89 days past due	1,318	5,795
More than 90 days past due	25,133	24,060
Nonaccrual	35,165	79,242
Total past due and nonaccrual	68,204	120,540
Current and accruing	1,144,044	1,056,495
Loans held for investment	1,212,248	1,177,035
Commercial and agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	72,252	79,704
Real estate - construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	64,083	58,414
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	636,107	553,538
Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	394,924	441,836
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	44,882	43,543
PC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	5,461	7,355
60 - 89 days past due	1,293	999
More than 90 days past due	0	227
Nonaccrual	35,165	79,242
Total past due and nonaccrual	41,919	87,823
Current and accruing	1,008,677	860,820
Loans held for investment	1,050,596	948,643
PC [Member] | Commercial and agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	18	515
60 - 89 days past due	43	0
More than 90 days past due	0	50
Nonaccrual	516	2,746
Total past due and nonaccrual	577	3,311
Current and accruing	60,946	61,727
Loans held for investment	61,523	65,038
PC [Member] | Real estate - construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	168	26
60 - 89 days past due	634	119
More than 90 days past due	0	0
Nonaccrual	4,677	14,297
Total past due and nonaccrual	5,479	14,442
Current and accruing	48,711	41,290
Loans held for investment	54,190	55,732
PC [Member] | Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	3,454	6,173
60 - 89 days past due	522	880
More than 90 days past due		0
Nonaccrual	11,580	18,372
Total past due and nonaccrual	15,556	25,425
Current and accruing	593,698	488,898
Loans held for investment	609,254	514,323
PC [Member] | Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	1,765	617
60 - 89 days past due	77	0
More than 90 days past due	0	177
Nonaccrual	18,380	43,621
Total past due and nonaccrual	20,222	44,415
Current and accruing	261,524	226,948
Loans held for investment	281,746	271,363
PC [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	56	24
60 - 89 days past due	17	0
More than 90 days past due		0
Nonaccrual	12	206
Total past due and nonaccrual	85	230
Current and accruing	43,798	41,957
Loans held for investment	43,883	42,187
PI [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	1,127	4,088
60 - 89 days past due	25	4,796
More than 90 days past due	25,133	23,833
Nonaccrual	0	0
Total past due and nonaccrual	26,285	32,717
Current and accruing	135,367	195,675
Loans held for investment	161,652	228,392
PI [Member] | Commercial and agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	35	100
60 - 89 days past due	16	1
More than 90 days past due	1,977	1,103
Nonaccrual		0
Total past due and nonaccrual	2,028	1,204
Current and accruing	8,701	13,462
Loans held for investment	10,729	14,666
PI [Member] | Real estate - construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	48	117
60 - 89 days past due	0	0
More than 90 days past due	2,758	655
Nonaccrual		0
Total past due and nonaccrual	2,806	772
Current and accruing	7,087	1,910
Loans held for investment	9,893	2,682
PI [Member] | Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	135	1,308
60 - 89 days past due	9	495
More than 90 days past due	2,907	4,678
Nonaccrual	0	0
Total past due and nonaccrual	3,051	6,481
Current and accruing	23,802	32,734
Loans held for investment	26,853	39,215
PI [Member] | Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	903	2,559
60 - 89 days past due	0	4,300
More than 90 days past due	17,479	17,384
Nonaccrual		0
Total past due and nonaccrual	18,382	24,243
Current and accruing	94,796	146,230
Loans held for investment	113,178	170,473
PI [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	6	4
60 - 89 days past due	0	0
More than 90 days past due	12	13
Nonaccrual		0
Total past due and nonaccrual	18	17
Current and accruing	981	1,339
Loans held for investment	$ 999	$ 1,356