Fair Value Measurements (Details 4) (USD $) In Thousands, unless otherwise specified																			3 Months Ended		9 Months Ended						3 Months Ended		9 Months Ended						9 Months Ended									3 Months Ended		9 Months Ended						3 Months Ended		9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Commercial, financial, and agricultural	Dec. 31, 2012 Commercial, financial, and agricultural	Sep. 30, 2013 Real estate construction - residential	Dec. 31, 2012 Real estate construction - residential	Sep. 30, 2013 Real estate construction - commercial	Dec. 31, 2012 Real estate construction - commercial	Sep. 30, 2013 Real estate mortgage - residential	Dec. 31, 2012 Real estate mortgage - residential	Sep. 30, 2013 Real estate mortgage - commercial	Dec. 31, 2012 Real estate mortgage - commercial	Sep. 30, 2013 Consumer	Dec. 31, 2012 Consumer	Sep. 30, 2013 Nonrecurring Total Fair Value	Sep. 30, 2012 Nonrecurring Total Fair Value	Sep. 30, 2013 Nonrecurring Significant Unobservable Inputs (Level 3)	Sep. 30, 2012 Nonrecurring Significant Unobservable Inputs (Level 3)	Sep. 30, 2013 Nonrecurring Total Gains (Losses)	Sep. 30, 2012 Nonrecurring Total Gains (Losses)	Sep. 30, 2013 Nonrecurring Total Gains (Losses)	Sep. 30, 2012 Nonrecurring Total Gains (Losses)	Sep. 30, 2013 Nonrecurring Commercial, financial, and agricultural Total Fair Value	Sep. 30, 2012 Nonrecurring Commercial, financial, and agricultural Total Fair Value	Sep. 30, 2013 Nonrecurring Commercial, financial, and agricultural Significant Unobservable Inputs (Level 3)	Sep. 30, 2012 Nonrecurring Commercial, financial, and agricultural Significant Unobservable Inputs (Level 3)	Sep. 30, 2013 Nonrecurring Commercial, financial, and agricultural Total Gains (Losses)	Sep. 30, 2012 Nonrecurring Commercial, financial, and agricultural Total Gains (Losses)	Sep. 30, 2013 Nonrecurring Commercial, financial, and agricultural Total Gains (Losses)	Sep. 30, 2012 Nonrecurring Commercial, financial, and agricultural Total Gains (Losses)	Sep. 30, 2013 Nonrecurring Real estate construction - residential Total Fair Value	Sep. 30, 2012 Nonrecurring Real estate construction - residential Total Fair Value	Sep. 30, 2013 Nonrecurring Real estate construction - residential Significant Unobservable Inputs (Level 3)	Sep. 30, 2012 Nonrecurring Real estate construction - residential Significant Unobservable Inputs (Level 3)	Sep. 30, 2013 Nonrecurring Real estate construction - residential Total Gains (Losses)	Sep. 30, 2013 Nonrecurring Real estate construction - commercial Total Fair Value	Sep. 30, 2012 Nonrecurring Real estate construction - commercial Total Fair Value	Sep. 30, 2013 Nonrecurring Real estate construction - commercial Significant Unobservable Inputs (Level 3)	Sep. 30, 2012 Nonrecurring Real estate construction - commercial Significant Unobservable Inputs (Level 3)	Sep. 30, 2013 Nonrecurring Real estate mortgage - residential Total Fair Value	Sep. 30, 2012 Nonrecurring Real estate mortgage - residential Total Fair Value	Sep. 30, 2013 Nonrecurring Real estate mortgage - residential Significant Unobservable Inputs (Level 3)	Sep. 30, 2012 Nonrecurring Real estate mortgage - residential Significant Unobservable Inputs (Level 3)	Sep. 30, 2013 Nonrecurring Real estate mortgage - residential Total Gains (Losses)	Sep. 30, 2012 Nonrecurring Real estate mortgage - residential Total Gains (Losses)	Sep. 30, 2013 Nonrecurring Real estate mortgage - residential Total Gains (Losses)	Sep. 30, 2012 Nonrecurring Real estate mortgage - residential Total Gains (Losses)	Sep. 30, 2013 Nonrecurring Real estate mortgage - commercial Total Fair Value	Sep. 30, 2012 Nonrecurring Real estate mortgage - commercial Total Fair Value	Sep. 30, 2013 Nonrecurring Real estate mortgage - commercial Significant Unobservable Inputs (Level 3)	Sep. 30, 2012 Nonrecurring Real estate mortgage - commercial Significant Unobservable Inputs (Level 3)	Sep. 30, 2013 Nonrecurring Real estate mortgage - commercial Total Gains (Losses)	Sep. 30, 2012 Nonrecurring Real estate mortgage - commercial Total Gains (Losses)	Sep. 30, 2013 Nonrecurring Real estate mortgage - commercial Total Gains (Losses)	Sep. 30, 2012 Nonrecurring Real estate mortgage - commercial Total Gains (Losses)	Sep. 30, 2013 Nonrecurring Consumer Total Fair Value	Sep. 30, 2013 Nonrecurring Consumer Significant Unobservable Inputs (Level 3)
Fair Value Measurements
Impaired loans with a specific allowance	$ 23,987	$ 24,630	$ 1,891	$ 885	$ 2,150	$ 189	$ 4,240	$ 5,883	$ 2,798	$ 3,832	$ 12,864	$ 13,797	$ 44	$ 44
Specific allowance related to impaired loans	4,581	4,020	576	213	248	125	250	542	719	1,069	2,782	2,071	6
Valuation methodologies used for assets and liabilities recorded at fair value on a nonrecurring basis
Impaired loans															19,406	23,382	19,406	23,382					1,315	876	1,315	876					1,902	130	1,902	130		3,990	5,458	3,990	5,458	2,079	2,311	2,079	2,311					10,082	14,607	10,082	14,607					38	38
Other real estate owned and repossessed assets															15,868	25,195	15,868	25,195
Gains (losses) on impaired loans																			(1,064)	(1,285)	(2,501)	(2,902)					(607)	(742)	(692)	(791)					(119)									(81)	(19)	(327)	(564)					(376)	(524)	(1,363)	(1,547)
Gains (losses) on other real estate owned and repossessed assets																			$ (320)	$ (2,778)	$ (5,006)	$ (3,186)