Loans and Asset Quality Information (Details 7) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Company's nonaccrual loans:
Nonaccrual loans	$ 92,684	$ 66,525
Commercial Unsecured
Company's nonaccrual loans:
Nonaccrual loans	167	457
Commercial Secured
Company's nonaccrual loans:
Nonaccrual loans	2,397	2,401
Secured by Inventory and Accounts Receivable
Company's nonaccrual loans:
Nonaccrual loans	862	76
Real Estate construction, land development and other land loans
Company's nonaccrual loans:
Nonaccrual loans	29,474	18,052
Real estate residential, farmland and mutli-family
Company's nonaccrual loans:
Nonaccrual loans	32,233	20,341
Real estate home equity lines of credit
Company's nonaccrual loans:
Nonaccrual loans	2,023	2,087
Real estate commercial
Company's nonaccrual loans:
Nonaccrual loans	24,692	20,227
Consumer
Company's nonaccrual loans:
Nonaccrual loans	836	2,884
Non-covered
Company's nonaccrual loans:
Nonaccrual loans	42,338	33,034
Non-covered | Commercial Unsecured
Company's nonaccrual loans:
Nonaccrual loans	66	307
Non-covered | Commercial Secured
Company's nonaccrual loans:
Nonaccrual loans	2,270	2,398
Non-covered | Secured by Inventory and Accounts Receivable
Company's nonaccrual loans:
Nonaccrual loans	36	17
Non-covered | Real Estate construction, land development and other land loans
Company's nonaccrual loans:
Nonaccrual loans	9,408	6,354
Non-covered | Real estate residential, farmland and mutli-family
Company's nonaccrual loans:
Nonaccrual loans	15,840	9,629
Non-covered | Real estate home equity lines of credit
Company's nonaccrual loans:
Nonaccrual loans	1,519	1,622
Non-covered | Real estate commercial
Company's nonaccrual loans:
Nonaccrual loans	12,427	9,885
Non-covered | Consumer
Company's nonaccrual loans:
Nonaccrual loans	772	2,822
Covered
Company's nonaccrual loans:
Nonaccrual loans	50,346	33,491
Covered | Commercial Unsecured
Company's nonaccrual loans:
Nonaccrual loans	101	150
Covered | Commercial Secured
Company's nonaccrual loans:
Nonaccrual loans	127	3
Covered | Secured by Inventory and Accounts Receivable
Company's nonaccrual loans:
Nonaccrual loans	826	59
Covered | Real Estate construction, land development and other land loans
Company's nonaccrual loans:
Nonaccrual loans	20,066	11,698
Covered | Real estate residential, farmland and mutli-family
Company's nonaccrual loans:
Nonaccrual loans	16,393	10,712
Covered | Real estate home equity lines of credit
Company's nonaccrual loans:
Nonaccrual loans	504	465
Covered | Real estate commercial
Company's nonaccrual loans:
Nonaccrual loans	12,265	10,342
Covered | Consumer
Company's nonaccrual loans:
Nonaccrual loans	$ 64	$ 62