Other Real Estate and Covered Other Real Estate - Changes and Losses, Net On Covered Other Real Estate (Details) - USD ($) $ in Thousands		12 Months Ended
	Jul. 01, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Covered Other Real Estate Roll Forward
Covered other real estate, beginning of period		$ 1,651	$ 6,060	$ 5,108
Transfers from covered loans		503	266	2,851
FASB ASC 310-30 adjustment for the residual recorded investment		62	(880)	136
Net transfers from covered loans		565	(614)	2,987
Disposals		(1,726)	(2,526)	(1,232)
Transfers to noncovered other real estate	$ (388)	(388)	0	0
Write-downs		(102)	(1,269)	(803)
Covered other real estate, end of period		0	1,651	6,060
Gain, net on the sale of covered other real estate included in other real estate expenses		$ 880	$ 46	$ 24