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) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2012
Debt Disclosure [Abstract]
Notes payable	$ 31,911	$ 2,093		$ 52,639
Federal Home Loan Bank advances	414,032	414,122		466,391
Securities sold under repurchase agreements	224,297	238,401		384,046
Other	31,947	36,010		26,991
Total other borrowings	256,244	274,411		411,037
Secured borrowings-owed to securitization investors	0	0	360,800	428,000
Subordinated notes	15,000	15,000		35,000
Total notes payable, Federal Home Loan Bank advances, other borrowings, secured borrowings, and subordinated notes	$ 717,187	$ 705,626		$ 1,393,067