Other Real Estate Owned - Changes in Purchased and Non-Purchased OREO (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Purchased OREO
Balance at January 1, 2018	$ 11,524
Transfers of loans	620
Impairments	(727)
Dispositions	(3,483)
Other	(2)
Balance at September 30, 2018	7,932
Non Purchased OREO
Balance at January 1, 2018	4,410
Transfers of loans	2,037
Impairments	(403)
Dispositions	(1,333)
Other	(46)
Balance at September 30, 2018	4,665
Total OREO
Balance at January 1, 2018	15,934
Transfers of loans	2,657
Impairments	(1,130)
Dispositions	(4,816)
Other	(48)
Balance at September 30, 2018	$ 12,597