Fair Value Measurement (Losses Resulting From Nonrecurring Fair Value Adjustments) (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss from nonrecurring measurements	$ 11,309	$ 7,502
Loans And Leases
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss from nonrecurring measurements	11,242	6,079
Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loss from nonrecurring measurements	$ 67	$ 1,423