Allowance For Loan Losses (Non Accrual Status) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment on nonaccrual status	$ 95,110	$ 98,444
Loans held for sale on nonaccrual status	0	4,529
Commercial and agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment on nonaccrual status	2,855	4,636
Real estate - construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment on nonaccrual status	24,853	30,844
Loans held for sale on nonaccrual status	0	1,807
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment on nonaccrual status	22,300	26,048
Loans held for sale on nonaccrual status	0	517
Real estate - mortgage, commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment on nonaccrual status	44,469	36,666
Loans held for sale on nonaccrual status	0	2,205
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment on nonaccrual status	633	250
Loans held for sale on nonaccrual status	$ 0	$ 0