Loans and Asset Quality Information (Details 7) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Nonaccrual loans	$ 107,032	$ 115,038	$ 108,627
Commercial Unsecured
Nonaccrual loans	293	452
Commercial Secured
Nonaccrual loans	3,389	2,548
Secured by Inventory and Accounts Receivable
Nonaccrual loans	732	690
Real Estate construction, land development and other land loans
Nonaccrual loans	34,890	43,976
Real estate residential, farmland and mutli-family
Nonaccrual loans	30,993	36,480
Real estate home equity lines of credit
Nonaccrual loans	3,937	4,229
Real estate commercial
Nonaccrual loans	29,910	23,662
Consumer
Nonaccrual loans	2,888	3,001
Non-covered
Nonaccrual loans	69,413	73,566	69,413
Non-covered | Commercial Unsecured
Nonaccrual loans	104	452
Non-covered | Commercial Secured
Nonaccrual loans	3,386	2,190
Non-covered | Secured by Inventory and Accounts Receivable
Nonaccrual loans	701	588
Non-covered | Real Estate construction, land development and other land loans
Nonaccrual loans	16,858	22,772
Non-covered | Real estate residential, farmland and mutli-family
Nonaccrual loans	21,980	25,430
Non-covered | Real estate home equity lines of credit
Nonaccrual loans	3,211	3,161
Non-covered | Real estate commercial
Nonaccrual loans	20,354	16,203
Non-covered | Consumer
Nonaccrual loans	2,819	2,770
Covered
Nonaccrual loans	37,619	41,472
Covered | Commercial Unsecured
Nonaccrual loans	189
Covered | Commercial Secured
Nonaccrual loans	3	358
Covered | Secured by Inventory and Accounts Receivable
Nonaccrual loans	31	102
Covered | Real Estate construction, land development and other land loans
Nonaccrual loans	18,032	21,204
Covered | Real estate residential, farmland and mutli-family
Nonaccrual loans	9,013	11,050
Covered | Real estate home equity lines of credit
Nonaccrual loans	726	1,068
Covered | Real estate commercial
Nonaccrual loans	9,556	7,459
Covered | Consumer
Nonaccrual loans	$ 69	$ 231