Loans Changes in Loss Share Receivable Associated with Covered Loans (Details) (USD $) In Thousands, unless otherwise specified				3 Months Ended		6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Jun. 30, 2013 Loss Share Receivable [Member]	Jun. 30, 2012 Loss Share Receivable [Member]	Jun. 30, 2013 Loss Share Receivable [Member]	Jun. 30, 2012 Loss Share Receivable [Member]
Changes in Loss Share Receivable [Roll Forward]
Balance at beginning of period				$ 95,593	$ 171,136	$ 113,734	$ 205,664
Accretion				(5,998)	(8,877)	(14,101)	(18,534)
Increase due to impairment				2,319	6,218	7,858	11,117
FDIC reimbursement				(5,397)	(10,651)	(15,947)	(38,081)
Covered loans paid in full				(2,607)	(5,211)	(7,634)	(7,551)
Balance at end of period	$ 83,900	$ 113,700	$ 152,600	$ 83,910	$ 152,615	$ 83,910	$ 152,615