Fair Value Measurement (Losses Resulting From Nonrecurring Fair Value Adjustments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total loss from nonrecurring measurements	$ 18,223	$ 19,327
Residential Mortgage-Backed Securities And Collateralized Mortgage Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loss from nonrecurring measurements		25
Non-Covered Loans And Leases [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loss from nonrecurring measurements	11,794	15,916
Non-Covered Other Real Estate Owned [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loss from nonrecurring measurements	3,523	2,130
Covered Other Real Estate Owned [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loss from nonrecurring measurements	$ 2,906	$ 1,256