Loans and Allowance for Loan Losses (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Summary of the allowance for loan losses
Balance at beginning of period	$ 15,358	$ 15,314	$ 14,842	$ 13,809
Additions:
Provision for loan losses		4,700	2,000	7,900
Deductions:
Loans charged off	1,426	3,303	3,301	5,555
Less recoveries on loans	(322)	(209)	(713)	(766)
Net loans charged off	1,104	3,094	2,588	4,789
Balance at end of period	14,254	16,920	14,254	16,920
Commercial, Financial, and Agricultural
Summary of the allowance for loan losses
Balance at beginning of period	2,119	3,045	1,937	1,804
Additions:
Provision for loan losses	444	1,239	725	2,469
Deductions:
Loans charged off	654	742	817	846
Less recoveries on loans	(201)	(18)	(265)	(133)
Net loans charged off	453	724	552	713
Balance at end of period	2,110	3,560	2,110	3,560
Real Estate Construction - Residential
Summary of the allowance for loan losses
Balance at beginning of period	932	709	732	1,188
Additions:
Provision for loan losses	32	(68)	351	(614)
Deductions:
Loans charged off			119
Less recoveries on loans				(67)
Net loans charged off			119	(67)
Balance at end of period	964	641	964	641
Real Estate Construction - Commercial
Summary of the allowance for loan losses
Balance at beginning of period	2,202	1,644	1,711	1,562
Additions:
Provision for loan losses	(216)	90	273	149
Deductions:
Loans charged off	135		135
Less recoveries on loans			(2)	(23)
Net loans charged off	135		133	(23)
Balance at end of period	1,851	1,734	1,851	1,734
Real Estate Mortgage - Residential
Summary of the allowance for loan losses
Balance at beginning of period	2,456	3,560	3,387	3,251
Additions:
Provision for loan losses	4	118	(586)	913
Deductions:
Loans charged off	368	41	754	618
Less recoveries on loans	(39)	(19)	(84)	(110)
Net loans charged off	329	22	670	508
Balance at end of period	2,131	3,656	2,131	3,656
Real Estate Mortgage - Commercial
Summary of the allowance for loan losses
Balance at beginning of period	7,415	6,107	6,834	5,734
Additions:
Provision for loan losses	(294)	3,241	1,142	4,793
Deductions:
Loans charged off	178	2,366	1,205	3,666
Less recoveries on loans	(34)	(96)	(206)	(217)
Net loans charged off	144	2,270	999	3,449
Balance at end of period	6,977	7,078	6,977	7,078
Installment Loans to Individuals
Summary of the allowance for loan losses
Balance at beginning of period	233	232	239	267
Additions:
Provision for loan losses	25	91	91	187
Deductions:
Loans charged off	91	154	271	425
Less recoveries on loans	(48)	(76)	(156)	(216)
Net loans charged off	43	78	115	209
Balance at end of period	215	245	215	245
Unallocated
Summary of the allowance for loan losses
Balance at beginning of period	1	17	2	3
Additions:
Provision for loan losses	5	(11)	4	3
Deductions:
Balance at end of period	$ 6	$ 6	$ 6	$ 6