Loans and Allowance for Loan Losses (Past Due Status) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	$ 6,482	$ 6,588
60 - 89 days past due	522	1,318
More than 90 days past due	25,097	25,133
Nonaccrual	33,603	35,165
Total past due and nonaccrual	65,704	68,204
Current and accruing	1,154,081	1,144,044
Loans held for investment	1,219,785	1,212,248	[1]
Commercial and agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	75,978	72,252
Real estate - construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	67,304	64,083
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	631,774	636,107
Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	396,110	394,924
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	48,619	44,882
PC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	6,069	5,461
60 - 89 days past due	327	1,293
More than 90 days past due	355	0
Nonaccrual	33,603	35,165
Total past due and nonaccrual	40,354	41,919
Current and accruing	1,030,398	1,008,677
Loans held for investment	1,070,752	1,050,596
PC [Member] | Commercial and agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	43	18
60 - 89 days past due	0	43
More than 90 days past due	0	0
Nonaccrual	450	516
Total past due and nonaccrual	493	577
Current and accruing	65,763	60,946
Loans held for investment	66,256	61,523
PC [Member] | Real estate - construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	68	168
60 - 89 days past due	0	634
More than 90 days past due	0	0
Nonaccrual	3,437	4,677
Total past due and nonaccrual	3,505	5,479
Current and accruing	52,599	48,711
Loans held for investment	56,104	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	4,130	3,454
60 - 89 days past due	0	522
More than 90 days past due	0	0
Nonaccrual	10,151	11,580
Total past due and nonaccrual	14,281	15,556
Current and accruing	597,094	593,698
Loans held for investment	611,375	609,254
PC [Member] | Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	1,760	1,765
60 - 89 days past due	324	77
More than 90 days past due	355	0
Nonaccrual	19,533	18,380
Total past due and nonaccrual	21,972	20,222
Current and accruing	267,586	261,524
Loans held for investment	289,558	281,746
PC [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	68	56
60 - 89 days past due	3	17
More than 90 days past due	0	0
Nonaccrual	32	12
Total past due and nonaccrual	103	85
Current and accruing	47,356	43,798
Loans held for investment	47,459	43,883
PI [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	413	1,127
60 - 89 days past due	195	25
More than 90 days past due	24,742	25,133
Nonaccrual	0	0
Total past due and nonaccrual	25,350	26,285
Current and accruing	123,683	135,367
Loans held for investment	149,033	161,652
PI [Member] | Commercial and agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	97	35
60 - 89 days past due	0	16
More than 90 days past due	2,354	1,977
Nonaccrual	0	0
Total past due and nonaccrual	2,451	2,028
Current and accruing	7,271	8,701
Loans held for investment	9,722	10,729
PI [Member] | Real estate - construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	54	48
60 - 89 days past due	0	0
More than 90 days past due	4,569	2,758
Nonaccrual	0	0
Total past due and nonaccrual	4,623	2,806
Current and accruing	6,577	7,087
Loans held for investment	11,200	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	137	135
60 - 89 days past due	195	9
More than 90 days past due	2,366	2,907
Nonaccrual	0	0
Total past due and nonaccrual	2,698	3,051
Current and accruing	17,701	23,802
Loans held for investment	20,399	26,853
PI [Member] | Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 days past due	123	903
60 - 89 days past due	0	0
More than 90 days past due	15,440	17,479
Nonaccrual	0	0
Total past due and nonaccrual	15,563	18,382
Current and accruing	90,989	94,796
Loans held for investment	106,552	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	13	12
Nonaccrual	0	0
Total past due and nonaccrual	15	18
Current and accruing	1,145	981
Loans held for investment	$ 1,160	$ 999

[1] Derived from audited consolidated financial statements