Covered Assets and Indemnification Asset - FDIC Indemnification Asset (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Activity in the FDIC Indemnification Asset
Balance, beginning of period	$ 40,304	$ 74,460	$ 71,313	$ 91,648
FDIC Indemnification Asset accretion (amortization)	(5,348)	33	(13,533)	189
Transfers to due from FDIC and other	(1,813)	(1,142)	(24,637)	(18,486)
Balance, end of period	$ 33,143	$ 73,351	33,143	$ 73,351
FDIC, collections received			$ 145,500