Estimated Fair Values (Assets And Liabilities Carried At Fair Value On A Nonrecurring Basis) (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale
Impaired loans, Covered by loss share agreements	247,361	192,406	142,116
Impaired loans, Not covered by loss share agreements	81,661	89,500	48,320
Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	78,178	88,933	79,853
Impaired loans, Covered by loss share agreements	247,361	192,406	142,116
Impaired loans, Not covered by loss share agreements	81,661	89,500	48,320
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale
Impaired loans, Covered by loss share agreements
Impaired loans, Not covered by loss share agreements
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	78,178	88,933	79,853
Impaired loans, Covered by loss share agreements
Impaired loans, Not covered by loss share agreements