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	Jun. 30, 2018	Dec. 31, 2017
Other real estate owned ("OREO") covered and not covered under a loss-share agreement, net of valuation allowances and direct write-downs
Purchased OREO	$ 9,006	$ 11,524
Non Purchased OREO	4,698	4,410
Total OREO	13,704	15,934
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	543	1,683
Non Purchased OREO	1,540	758
Total OREO	2,083	2,441
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	3,257	4,314
Non Purchased OREO	1,484	1,624
Total OREO	4,741	5,938
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	724	1,100
Non Purchased OREO	605	781
Total OREO	1,329	1,881
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	4,482	4,427
Non Purchased OREO	1,069	1,247
Total OREO	$ 5,551	$ 5,674