Fair Value Measurements (Foreclosed Assets Remeasured And Reported At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Fair Value, Assets Measured on Nonrecurring Basis [Line Items]
Charge-offs recognized in the allowance for loan losses	$ (8,128)	$ (14,596)
Foreclosed Assets Remeasured At Initial Recognition [Member]
Fair Value, Assets Measured on Nonrecurring Basis [Line Items]
Carrying value of foreclosed assets prior to remeasurement	1,386	8,804
Charge-offs recognized in the allowance for loan losses	(315)	(1,370)
Fair value	1,071	7,434
Foreclosed Assets Remeasured Subsequent To Initial Recognition [Member]
Fair Value, Assets Measured on Nonrecurring Basis [Line Items]
Carrying value of foreclosed assets prior to remeasurement	372	936
Write-downs included in other non-interest expense	(75)	(241)
Fair value	$ 297	$ 695