Fair Value Measurement (Losses Resulting From Nonrecurring Fair Value Adjustments) (Details) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss from nonrecurring measurements	$ 13,993	$ 29,331	$ 49,594
Residential Mortgage-Backed Securities And Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss from nonrecurring measurements	0	0	155
Loans And Leases [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss from nonrecurring measurements	10,265	27,171	37,897
Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss from nonrecurring measurements	$ 3,728	$ 2,160	$ 11,542