Other Real Estate Owned - 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, 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	$ 9,754	$ 11,524
Non Purchased OREO	4,801	4,410
Total OREO	14,555	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	1,061	1,683
Non Purchased OREO	1,087	758
Total OREO	2,148	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	3,593	4,314
Non Purchased OREO	1,572	1,624
Total OREO	5,165	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	698	1,100
Non Purchased OREO	1,045	781
Total OREO	1,743	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	4,402	4,427
Non Purchased OREO	1,097	1,247
Total OREO	$ 5,499	$ 5,674