Loans and Allowance for Loan Losses (Loans on Nonaccrual Status) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	$ 6,219	$ 17,177
Other real estate owned	28,002	36,952
Total nonperforming crdit-related assets	34,221	54,129
Construction and Land Development Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	1,465	4,398
Other Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	2,658	9,937
Asset-based Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	0	0
Other Commercial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	613	913
Home Equity Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	98	474
Other 1-4 Family Residential Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	1,369	1,422
Consumer Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total nonaccrual loans	$ 16	$ 33