Loans Changes in Loss Share Receivable Associated with Covered Loans (Details) (Loss Share Receivable, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Loss Share Receivable
Changes in Loss Share Receivable [Roll Forward]
Balance at beginning of period	$ 83,910	$ 152,615	$ 113,734	$ 205,664
Accretion	(5,226)	(8,401)	(19,327)	(26,935)
Increase due to impairment	1,032	1,484	8,890	12,601
FDIC reimbursement	(7,284)	(12,597)	(23,231)	(50,678)
Covered loans paid in full	(2,446)	(1,229)	(10,080)	(8,780)
Balance at end of period	$ 69,986	$ 131,872	$ 69,986	$ 131,872