Loans (Schedule Of Carrying Value Of Loans Pledged) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Loans [Line Items]
FRB discount window borrowings	$ 1,065,690	[1]	$ 1,352,012	[1]
FHLB advances	1,019,390		583,507
Total	$ 2,085,080		$ 1,935,519

[1] No borrowings were outstanding at June 30, 2012 or December 31, 2011.