Other Real Estate Owned - Covered and Not Covered Under a Loss-Share Agreement, Net of Valuation Allowances and Direct Write-Downs (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Other real estate owned ("OREO") covered and not covered under a loss-share agreement, net of valuation allowances and direct write-downs
Purchased OREO	$ 5,932	$ 6,187
Non Purchased OREO	4,223	4,853
Total OREO	10,155	11,040
Residential real estate
Other real estate owned ("OREO") covered and not covered under a loss-share agreement, net of valuation allowances and direct write-downs
Purchased OREO	887	423
Non Purchased OREO	1,764	1,910
Total OREO	2,651	2,333
Commercial real estate
Other real estate owned ("OREO") covered and not covered under a loss-share agreement, net of valuation allowances and direct write-downs
Purchased OREO	2,317	2,686
Non Purchased OREO	1,391	1,611
Total OREO	3,708	4,297
Residential land development
Other real estate owned ("OREO") covered and not covered under a loss-share agreement, net of valuation allowances and direct write-downs
Purchased OREO	675	678
Non Purchased OREO	420	421
Total OREO	1,095	1,099
Commercial land development
Other real estate owned ("OREO") covered and not covered under a loss-share agreement, net of valuation allowances and direct write-downs
Purchased OREO	2,053	2,400
Non Purchased OREO	648	911
Total OREO	$ 2,701	$ 3,311