Other Real Estate Owned and Repossessed Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Changes in other real estate owned
Balance at the beginning of the period	$ 9,716	$ 13,953	$ 9,518
Additions due to acquisitions	13,227	440	3,721
Other additions	9,938	6,957	8,986
Net payments received	(1,560)	(45)	(264)
Disposals	(13,873)	(10,168)	(7,360)
Write-downs	(636)	(1,421)	(648)
Balance at the end of the period	16,812	9,716	13,953
Changes in repossessed assets
Balance at the beginning of the period	219	252	258
Additions due to acquisitions	313	0	0
Other additions	3,032	2,372	2,322
Net payments received	(763)	(22)	(30)
Disposals	(2,426)	(2,383)	(2,298)
Write-downs	0	0	0
Balance at the end of the period	$ 375	$ 219	$ 252