Fair Value Of Assets And Liabilities (Changes In Fair Value Of Assets And Liabilities Which Fair Value Option Included In Current Period Earnings) (Details) (Mortgage Banking Noninterest Income [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Loans Held For Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value included in net income	$ (2,799)	$ (3,195)	$ (849)	$ 1,928
Other Short Term Borrowings [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value included in net income	$ 854	$ 7,831	$ 3,248	$ 11,495