FDIC Indemnification Asset (Changes in the FDIC Indemnification Asset) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Sep. 30, 2015
FDIC Indemnification Asset [Roll Forward]
FDIC Indemnification Asset and Liability, net			$ 974,335	$ 1,205,117	$ 1,205,117
Amortization of FDIC indemnification asset	$ (28,409)	$ (17,948)	(76,874)	(48,883)	(69,470)
Decrease in FDIC indemnification asset for claims filed			(46,307)	(94,320)	(114,916)
Net loss on FDIC indemnification	(15,988)	$ (16,958)	(53,024)	(39,758)	(46,396)
FDIC Indemnification Asset and Liability, net	798,130		798,130		974,335
FDIC indemnification asset	798,223		798,223		974,704
Other Liabilities						$ (93)
FDIC Indemnification Asset and Liability, net	$ 798,130		$ 974,335	$ 1,205,117	$ 1,205,117	$ 798,130