Receivable from FDIC for Loss Share Agreements (Changes in Receivable from FDIC) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Receivable From FDIC For Loss Share Agreements [Roll Forward]
Balance at beginning of period	$ 313,978		$ 522,507		$ 539,511	[1]	$ 623,261
Additional receivable from acquisitions	0		159,753		0		295,053
Accretion of discounts and premiums, net	(26,476)		(27,448)		(71,017)		(26,034)
Receipt of payments from FDIC	(31,765)		(27,872)		(223,863)		(239,800)
Post-acquisition and other adjustments, net	(11,844)		(19,033)		(738)		(44,573)
Balance at end of period	243,893	[2]	607,907	[2]	243,893	[2]	607,907	[2]
Adjustments to acquisition gains	$ 0

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

[2] Unaudited