Loans and Asset Quality Information (Details 12) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Non-covered loans	$ 2,137,074	$ 2,069,152
Unamortized net deferred loan costs	1,478	1,280	1,295
Covered loans	303,997	361,234	373,824
Total loans	2,441,071	2,430,386	2,432,548
Commercial Unsecured
Non-covered loans	36,833	38,778
Commercial Secured
Non-covered loans	113,608	111,751
Secured by Inventory and Accounts Receivable
Non-covered loans	21,275	21,828
Real Estate construction, land development and other land loans
Non-covered loans	236,960	246,805
Real estate residential, farmland and mutli-family
Non-covered loans	826,953	795,655
Real estate home equity lines of credit
Non-covered loans	203,154	207,436
Real estate commercial
Non-covered loans	640,578	587,183
Consumer
Non-covered loans	56,235	58,436
Pass (Grades 1, 2 & 3)
Non-covered loans	608,057	650,801
Covered loans	48,087	62,052
Total loans	656,144	712,853
Pass (Grades 1, 2 & 3) | Commercial Unsecured
Non-covered loans	10,081	13,516
Pass (Grades 1, 2 & 3) | Commercial Secured
Non-covered loans	33,284	36,587
Pass (Grades 1, 2 & 3) | Secured by Inventory and Accounts Receivable
Non-covered loans	3,457	3,756
Pass (Grades 1, 2 & 3) | Real Estate construction, land development and other land loans
Non-covered loans	31,087	37,596
Pass (Grades 1, 2 & 3) | Real estate residential, farmland and mutli-family
Non-covered loans	246,143	257,163
Pass (Grades 1, 2 & 3) | Real estate home equity lines of credit
Non-covered loans	126,885	130,913
Pass (Grades 1, 2 & 3) | Real estate commercial
Non-covered loans	128,567	140,577
Pass (Grades 1, 2 & 3) | Consumer
Non-covered loans	28,553	30,693
Weak Pass (Grade 4)
Non-covered loans	1,289,064	1,182,646
Covered loans	130,986	161,508
Total loans	1,420,050	1,344,154
Weak Pass (Grade 4) | Commercial Unsecured
Non-covered loans	25,473	23,735
Weak Pass (Grade 4) | Commercial Secured
Non-covered loans	69,884	66,105
Weak Pass (Grade 4) | Secured by Inventory and Accounts Receivable
Non-covered loans	15,974	16,197
Weak Pass (Grade 4) | Real Estate construction, land development and other land loans
Non-covered loans	162,999	156,651
Weak Pass (Grade 4) | Real estate residential, farmland and mutli-family
Non-covered loans	487,571	456,188
Weak Pass (Grade 4) | Real estate home equity lines of credit
Non-covered loans	65,701	67,606
Weak Pass (Grade 4) | Real estate commercial
Non-covered loans	438,254	372,614
Weak Pass (Grade 4) | Consumer
Non-covered loans	23,208	23,550
Watch or Standard Loans (Grade 9)
Non-covered loans	44,859	52,156
Covered loans
Total loans	44,859	52,156
Watch or Standard Loans (Grade 9) | Commercial Unsecured
Non-covered loans	10	13
Watch or Standard Loans (Grade 9) | Commercial Secured
Non-covered loans	1,792	1,912
Watch or Standard Loans (Grade 9) | Secured by Inventory and Accounts Receivable
Non-covered loans	257	282
Watch or Standard Loans (Grade 9) | Real Estate construction, land development and other land loans
Non-covered loans	3,891	6,490
Watch or Standard Loans (Grade 9) | Real estate residential, farmland and mutli-family
Non-covered loans	7,891	10,248
Watch or Standard Loans (Grade 9) | Real estate home equity lines of credit
Non-covered loans	2,487	2,422
Watch or Standard Loans (Grade 9) | Real estate commercial
Non-covered loans	28,453	30,722
Watch or Standard Loans (Grade 9) | Consumer
Non-covered loans	78	67
Special Mention Loans (Grade 5)
Non-covered loans	69,032	44,497
Covered loans	8,580	8,033
Total loans	77,612	52,530
Special Mention Loans (Grade 5) | Commercial Unsecured
Non-covered loans	539	217
Special Mention Loans (Grade 5) | Commercial Secured
Non-covered loans	3,943	2,196
Special Mention Loans (Grade 5) | Secured by Inventory and Accounts Receivable
Non-covered loans	767	756
Special Mention Loans (Grade 5) | Real Estate construction, land development and other land loans
Non-covered loans	13,628	9,903
Special Mention Loans (Grade 5) | Real estate residential, farmland and mutli-family
Non-covered loans	29,967	17,687
Special Mention Loans (Grade 5) | Real estate home equity lines of credit
Non-covered loans	2,895	1,868
Special Mention Loans (Grade 5) | Real estate commercial
Non-covered loans	16,365	11,502
Special Mention Loans (Grade 5) | Consumer
Non-covered loans	928	368
Classified Loans (Grades 6,7 & 8)
Non-covered loans	55,171	64,206
Covered loans	78,725	88,169
Total loans	133,896	152,375
Classified Loans (Grades 6,7 & 8) | Commercial Unsecured
Non-covered loans	626	845
Classified Loans (Grades 6,7 & 8) | Commercial Secured
Non-covered loans	1,319	2,761
Classified Loans (Grades 6,7 & 8) | Secured by Inventory and Accounts Receivable
Non-covered loans	119	249
Classified Loans (Grades 6,7 & 8) | Real Estate construction, land development and other land loans
Non-covered loans	8,497	13,393
Classified Loans (Grades 6,7 & 8) | Real estate residential, farmland and mutli-family
Non-covered loans	33,401	28,939
Classified Loans (Grades 6,7 & 8) | Real estate home equity lines of credit
Non-covered loans	1,975	1,466
Classified Loans (Grades 6,7 & 8) | Real estate commercial
Non-covered loans	8,585	15,565
Classified Loans (Grades 6,7 & 8) | Consumer
Non-covered loans	649	988
Nonaccrual Loans
Non-covered loans	69,413	73,566
Covered loans	37,619	41,472
Total loans	107,032	115,038
Nonaccrual Loans | Commercial Unsecured
Non-covered loans	104	452
Nonaccrual Loans | Commercial Secured
Non-covered loans	3,386	2,190
Nonaccrual Loans | Secured by Inventory and Accounts Receivable
Non-covered loans	701	588
Nonaccrual Loans | Real Estate construction, land development and other land loans
Non-covered loans	16,858	22,772
Nonaccrual Loans | Real estate residential, farmland and mutli-family
Non-covered loans	21,980	25,430
Nonaccrual Loans | Real estate home equity lines of credit
Non-covered loans	3,211	3,161
Nonaccrual Loans | Real estate commercial
Non-covered loans	20,354	16,203
Nonaccrual Loans | Consumer
Non-covered loans	2,819	2,770
Non-covered
Non-covered loans	$ 2,135,596	$ 2,067,872