Receivable from FDIC for Loss Share Agreements (Changes in Receivable from FDIC) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Receivable From FDIC For Loss Share Agreements [Roll Forward]
Balance at beginning of period	$ 270,192	[1]	$ 617,377
Accretion of discounts and premiums, net	(26,112)		(20,063)
Receipt of payments from FDIC	(42,519)		(123,204)
Post-acquisition and other adjustments, net	(5,619)		18,274
Balance at end of period	$ 195,942	[2]	$ 492,384	[2]

[1] Derived from 2012 Annual Report on Form 10-K.

[2] Unaudited