Other Real Estate Owned - Changes in Purchased and Non-Purchased OREO (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Purchased OREO
Balance at January 1, 2018	$ 11,524
Transfers of loans	515
Impairments	(455)
Dispositions	(2,576)
Other	(2)
Balance at June 30, 2018	9,006
Non Purchased OREO
Balance at January 1, 2018	4,410
Transfers of loans	1,776
Impairments	(294)
Dispositions	(1,193)
Other	(1)
Balance at June 30, 2018	4,698
Total OREO
Balance at January 1, 2018	15,934
Transfers of loans	2,291
Impairments	(749)
Dispositions	(3,769)
Other	(3)
Balance at June 30, 2018	$ 13,704