Covered Assets and Indemnification Asset - Covered OREO (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Activity in covered OREO
Balance, beginning of period	$ 42,304	$ 67,634	$ 51,642	$ 99,090
Additions to covered OREO	1,039	2,422	6,166	11,703
Dispositions of covered OREO	(2,612)	(5,516)	(14,942)	(34,521)
Valuation adjustments in the period	(388)	(2,552)	(2,523)	(14,284)
Balance, end of period	$ 40,343	$ 61,988	$ 40,343	$ 61,988