Covered Assets and FDIC Loss-sharing Asset (FDIC Loss-sharing Asset) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
(Amortization) accretion			$ 6,900	$ 6,084
Other	(1,158)	(967)	(2,087)	(1,897)
FDIC Loss-sharing Asset [Member]
Balance at beginning of period	193,053	210,405	205,991	0
Acquired through acquisitions	65,278	0	65,278	210,405
Cash received from the FDIC	(44,892)	0	(44,892)	0
FDIC share of additional estimated losses	991	13,947	2,295	13,947
Other	(1,773)	(1,006)	(1,241)	(1,006)
(Amortization) accretion	(6,638)	3,952	(15,641)	3,952
Covered Loan Loss Provision	1,841	0	1,503	0
Other	(1,622)	(553)	(7,055)	(553)
Balance at end of period	$ 206,238	$ 226,745	$ 206,238	$ 226,745