Loans and Asset Quality Information (Details 6) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Company's nonaccrual loans:
Nonaccrual loans	$ 87,944	$ 66,525
Commercial Unsecured
Company's nonaccrual loans:
Nonaccrual loans	153	457
Commercial Secured
Company's nonaccrual loans:
Nonaccrual loans	2,533	2,401
Secured by Inventory and Accounts Receivable
Company's nonaccrual loans:
Nonaccrual loans	964	76
Real Estate construction, land development and other land loans
Company's nonaccrual loans:
Nonaccrual loans	24,937	18,052
Real estate residential, farmland and mutli-family
Company's nonaccrual loans:
Nonaccrual loans	33,357	20,341
Real estate home equity lines of credit
Company's nonaccrual loans:
Nonaccrual loans	3,010	2,087
Real estate commercial
Company's nonaccrual loans:
Nonaccrual loans	22,608	20,227
Consumer
Company's nonaccrual loans:
Nonaccrual loans	382	2,884
Non-covered
Company's nonaccrual loans:
Nonaccrual loans	40,711	33,034
Non-covered | Commercial Unsecured
Company's nonaccrual loans:
Nonaccrual loans	46	307
Non-covered | Commercial Secured
Company's nonaccrual loans:
Nonaccrual loans	2,414	2,398
Non-covered | Secured by Inventory and Accounts Receivable
Company's nonaccrual loans:
Nonaccrual loans	151	17
Non-covered | Real Estate construction, land development and other land loans
Company's nonaccrual loans:
Nonaccrual loans	8,074	6,354
Non-covered | Real estate residential, farmland and mutli-family
Company's nonaccrual loans:
Nonaccrual loans	16,558	9,629
Non-covered | Real estate home equity lines of credit
Company's nonaccrual loans:
Nonaccrual loans	1,927	1,622
Non-covered | Real estate commercial
Company's nonaccrual loans:
Nonaccrual loans	11,221	9,885
Non-covered | Consumer
Company's nonaccrual loans:
Nonaccrual loans	320	2,822
Covered
Company's nonaccrual loans:
Nonaccrual loans	47,233	33,491
Covered | Commercial Unsecured
Company's nonaccrual loans:
Nonaccrual loans	107	150
Covered | Commercial Secured
Company's nonaccrual loans:
Nonaccrual loans	119	3
Covered | Secured by Inventory and Accounts Receivable
Company's nonaccrual loans:
Nonaccrual loans	813	59
Covered | Real Estate construction, land development and other land loans
Company's nonaccrual loans:
Nonaccrual loans	16,863	11,698
Covered | Real estate residential, farmland and mutli-family
Company's nonaccrual loans:
Nonaccrual loans	16,799	10,712
Covered | Real estate home equity lines of credit
Company's nonaccrual loans:
Nonaccrual loans	1,083	465
Covered | Real estate commercial
Company's nonaccrual loans:
Nonaccrual loans	11,387	10,342
Covered | Consumer
Company's nonaccrual loans:
Nonaccrual loans	$ 62	$ 62