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	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Debt Disclosure [Abstract]
Notes payable	$ 1,546	$ 2,093	$ 2,275
Federal Home Loan Bank advances	387,852	414,122	414,211
Securities sold under repurchase agreements	223,211	238,401	337,405
Other	23,659	36,010	39,824
Total other borrowings	246,870	274,411	377,229
Subordinated notes	10,000	15,000	15,000
Total notes payable, Federal Home Loan Bank advances, other borrowings and subordinated notes	$ 646,268	$ 705,626	$ 808,715