Receivable from FDIC for Loss Share Agreements (Changes in Receivable from FDIC) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Receivable From FDIC For Loss Share Agreements [Roll Forward]
Balance at beginning of period	$ 539,511	[1]	$ 623,261
Additional receivable from acquisitions	0		140,285
Accretion of discounts and premiums, net	1,562		1,046
Receipt of payments from FDIC	(123,204)		(128,845)
Post-acquisition and other adjustments, net	(7,518)		(11,425)
Balance at March 31	410,351	[2]	624,322	[2]
Adjustments to acquisition gains	$ 0

[1] Derived from 2011 Annual Report on Form 10-K.

[2] Unaudited