FDIC Indemnification Asset (Changes in the FDIC Indemnification Asset) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
FDIC Indemnification Asset [Roll Forward]
FDIC Indemnification Asset and Liability, net			$ 739,843	$ 974,335	$ 974,335
Amortization of FDIC indemnification asset	$ (38,957)	$ (28,409)	(116,711)	(76,874)	(109,411)
Decrease in FDIC indemnification asset for claims filed			(30,829)	(46,307)	(59,139)
Net gain (loss) on FDIC indemnification	993	$ (15,988)	(9,410)	$ (53,024)	(65,942)
FDIC Indemnification Asset and Liability, net	$ 582,893		$ 582,893		$ 739,843