Other Real Estate and Covered Other Real Estate - Changes and Losses, Net On Covered Other Real Estate (Details) - USD ($) $ in Thousands		9 Months Ended
	Jul. 01, 2016	Sep. 30, 2016	Sep. 30, 2015
Covered Other Real Estate Roll Forward
Covered other real estate, beginning of period		$ 1,651	$ 6,060
Transfers from covered loans		456	266
FASB ASC 310-30 adjustment for the residual recorded investment		(12)	(902)
Net transfers from covered loans		444	(636)
Disposals		(1,679)	(1,404)
Transfers to noncovered other real estate	$ (388)	(388)
Write-downs		(28)	(1,155)
Covered other real estate, end of period		0	2,865
Gain (loss), net on the sale of covered other real estate included in other real estate expense		$ 801	$ (54)