Loans and Allowance for Loan Losses (Troubled Debt Restructurings) (Details) (USD $) In Thousands	Sep. 30, 2011
Restructured loans	$ 101,029
Balance 90 days past due at any time during previous 12 months	18,717
Business [Member] | Commercial [Member]
Restructured loans	19,079
Real Estate - Construction and Land [Member] | Commercial [Member]
Restructured loans	39,119
Real Estate - Construction and Land [Member] | Commercial [Member]
Balance 90 days past due at any time during previous 12 months	11,805
Real Estate - Business [Member] | Commercial [Member]
Restructured loans	18,467
Real Estate - Business [Member] | Commercial [Member]
Balance 90 days past due at any time during previous 12 months	1,595
Real Estate - Personal [Member] | Personal Banking [Member]
Restructured loans	2,217
Consumer Credit Card [Member] | Personal Banking [Member]
Restructured loans	22,147
Consumer Credit Card [Member] | Personal Banking [Member]
Balance 90 days past due at any time during previous 12 months	$ 5,317