Notes Payable, Federal Home Loan Bank Advances, Other Borrowings, Secured Borrowings And Subordinated Notes (Summary Of Notes Payable, Federal Home Loan Bank Advances, Other Borrowings, Secured Borrowings And Subordinated Notes) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Notes Payable, Federal Home Loan Bank Advances, Other Borrowings, Secured Borrowings And Subordinated Notes [Abstract]
Notes payable	$ 52,639	$ 52,822	$ 1,000
Federal Home Loan Bank advances	466,391	474,481	423,500
Securities sold under repurchase agreements	384,046	413,333	209,911
Other	26,991	30,420	40,121
Total other borrowings	411,037	443,753	250,032
Secured borrowings - owed to securitization investors	428,000	600,000	600,000
Subordinated notes	35,000	35,000	50,000
Total notes payable, Federal Home Loan Bank advances, other borrowings, secured borrowings, and subordinated notes	$ 1,393,067	$ 1,606,056	$ 1,324,532