Fair Value Measurements (Details 4) (USD $) In Thousands, unless otherwise specified																			3 Months Ended		6 Months Ended						3 Months Ended		6 Months Ended						6 Months Ended									3 Months Ended		6 Months Ended						3 Months Ended	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Commercial, financial, and agricultural	Dec. 31, 2012 Commercial, financial, and agricultural	Jun. 30, 2013 Real estate construction - residential	Dec. 31, 2012 Real estate construction - residential	Jun. 30, 2013 Real estate construction - commercial	Dec. 31, 2012 Real estate construction - commercial	Jun. 30, 2013 Real estate mortgage - residential	Dec. 31, 2012 Real estate mortgage - residential	Jun. 30, 2013 Real estate mortgage - commercial	Dec. 31, 2012 Real estate mortgage - commercial	Jun. 30, 2013 Consumer	Dec. 31, 2012 Consumer	Jun. 30, 2013 Nonrecurring Total Fair Value	Jun. 30, 2012 Nonrecurring Total Fair Value	Jun. 30, 2013 Nonrecurring Significant Unobservable Inputs (Level 3)	Jun. 30, 2012 Nonrecurring Significant Unobservable Inputs (Level 3)	Jun. 30, 2013 Nonrecurring Total Gains (Losses)	Jun. 30, 2012 Nonrecurring Total Gains (Losses)	Jun. 30, 2013 Nonrecurring Total Gains (Losses)	Jun. 30, 2012 Nonrecurring Total Gains (Losses)	Jun. 30, 2013 Nonrecurring Commercial, financial, and agricultural Total Fair Value	Jun. 30, 2012 Nonrecurring Commercial, financial, and agricultural Total Fair Value	Jun. 30, 2013 Nonrecurring Commercial, financial, and agricultural Significant Unobservable Inputs (Level 3)	Jun. 30, 2012 Nonrecurring Commercial, financial, and agricultural Significant Unobservable Inputs (Level 3)	Jun. 30, 2013 Nonrecurring Commercial, financial, and agricultural Total Gains (Losses)	Jun. 30, 2012 Nonrecurring Commercial, financial, and agricultural Total Gains (Losses)	Jun. 30, 2013 Nonrecurring Commercial, financial, and agricultural Total Gains (Losses)	Jun. 30, 2012 Nonrecurring Commercial, financial, and agricultural Total Gains (Losses)	Jun. 30, 2013 Nonrecurring Real estate construction - residential Total Fair Value	Jun. 30, 2012 Nonrecurring Real estate construction - residential Total Fair Value	Jun. 30, 2013 Nonrecurring Real estate construction - residential Significant Unobservable Inputs (Level 3)	Jun. 30, 2012 Nonrecurring Real estate construction - residential Significant Unobservable Inputs (Level 3)	Jun. 30, 2013 Nonrecurring Real estate construction - residential Total Gains (Losses)	Jun. 30, 2013 Nonrecurring Real estate construction - commercial Total Fair Value	Jun. 30, 2012 Nonrecurring Real estate construction - commercial Total Fair Value	Jun. 30, 2013 Nonrecurring Real estate construction - commercial Significant Unobservable Inputs (Level 3)	Jun. 30, 2012 Nonrecurring Real estate construction - commercial Significant Unobservable Inputs (Level 3)	Jun. 30, 2013 Nonrecurring Real estate mortgage - residential Total Fair Value	Jun. 30, 2012 Nonrecurring Real estate mortgage - residential Total Fair Value	Jun. 30, 2013 Nonrecurring Real estate mortgage - residential Significant Unobservable Inputs (Level 3)	Jun. 30, 2012 Nonrecurring Real estate mortgage - residential Significant Unobservable Inputs (Level 3)	Jun. 30, 2013 Nonrecurring Real estate mortgage - residential Total Gains (Losses)	Jun. 30, 2012 Nonrecurring Real estate mortgage - residential Total Gains (Losses)	Jun. 30, 2013 Nonrecurring Real estate mortgage - residential Total Gains (Losses)	Jun. 30, 2012 Nonrecurring Real estate mortgage - residential Total Gains (Losses)	Jun. 30, 2013 Nonrecurring Real estate mortgage - commercial Total Fair Value	Jun. 30, 2012 Nonrecurring Real estate mortgage - commercial Total Fair Value	Jun. 30, 2013 Nonrecurring Real estate mortgage - commercial Significant Unobservable Inputs (Level 3)	Jun. 30, 2012 Nonrecurring Real estate mortgage - commercial Significant Unobservable Inputs (Level 3)	Jun. 30, 2012 Nonrecurring Real estate mortgage - commercial Total Gains (Losses)	Jun. 30, 2013 Nonrecurring Real estate mortgage - commercial Total Gains (Losses)	Jun. 30, 2012 Nonrecurring Real estate mortgage - commercial Total Gains (Losses)	Jun. 30, 2013 Nonrecurring Consumer Total Fair Value	Jun. 30, 2013 Nonrecurring Consumer Significant Unobservable Inputs (Level 3)
Fair Value Measurements
Impaired loans with a specific allowance	$ 27,943	$ 24,630	$ 1,960	$ 885	$ 2,175	$ 189	$ 4,889	$ 5,883	$ 4,149	$ 3,832	$ 14,726	$ 13,797	$ 44	$ 44
Specific allowance related to impaired loans	5,886	4,020	580	213	248	125	768	542	1,156	1,069	3,128	2,071	6
Valuation methodologies used for assets and liabilities recorded at fair value on a nonrecurring basis
Impaired loans															22,057	23,028	22,057	23,028					1,380	2,242	1,380	2,242					1,927	130	1,927	130		4,121	5,553	4,121	5,553	2,993	2,261	2,993	2,261					11,598	12,842	11,598	12,842				38	38
Other real estate owned and repossessed assets															24,793	21,583	24,793	21,583
Gains (losses) on impaired loans																			(86)	(870)	(1,437)	(1,617)					(75)	(14)	(85)	(49)					(119)									(11)	(422)	(246)	(545)					(434)	(987)	(1,023)
Gains (losses) on other real estate owned and repossessed assets																			$ (4,485)	$ (139)	$ (4,686)	$ (408)