Other Real Estate Owned - Changes in Purchased and Non-Purchased OREO (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2018
Purchased OREO
Balance at January 1, 2018	$ 11,524
Transfers of loans	39
Impairments	(305)
Dispositions	(1,504)
Balance at March 31, 2018	9,754
Non Purchased OREO
Balance at January 1, 2018	4,410
Transfers of loans	1,115
Impairments	(47)
Dispositions	(677)
Balance at March 31, 2018	4,801
Total OREO
Balance at January 1, 2018	15,934
Transfers of loans	1,154
Impairments	(352)
Dispositions	(2,181)
Balance at March 31, 2018	$ 15,934	$ 14,555