Allowance for Loan Losses (Details 5) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Collateral value securing non-accrual loans
Non-accrual Loans	$ 54,079	$ 80,760
Collateral Value	76,970	96,353
Commercial, financial & agricultural loans [Member]
Collateral value securing non-accrual loans
Non-accrual Loans	15,633	16,867
Commercial real estate mortgages [Member]
Collateral value securing non-accrual loans
Non-accrual Loans	22,541	45,344
Collateral Value	52,840	68,067
Real estate construction loans [Member]
Collateral value securing non-accrual loans
Non-accrual Loans	6,334	6,978
Collateral Value	2,666	6,715
Residential mortgages (1st and 2nd liens) [Member]
Collateral value securing non-accrual loans
Non-accrual Loans	5,847	7,028
Collateral Value	14,319	14,133
Home equity loans [Member]
Collateral value securing non-accrual loans
Non-accrual Loans	3,560	3,897
Collateral Value	7,145	7,438
Consumer loans [Member]
Collateral value securing non-accrual loans
Non-accrual Loans	$ 164	$ 646