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	Sep. 30, 2017	Dec. 31, 2016
Other real estate owned ("OREO") covered and not covered under a loss-share agreement, net of valuation allowances and direct write-downs
Purchased OREO	$ 13,296	$ 17,370
Non Purchased OREO	4,524	5,929
Total OREO	17,820	23,299
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	1,780	2,230
Non Purchased OREO	847	699
Total OREO	2,627	2,929
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	5,552	6,401
Non Purchased OREO	1,401	1,680
Total OREO	6,953	8,081
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	1,233	2,344
Non Purchased OREO	829	1,688
Total OREO	2,062	4,032
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	4,731	6,395
Non Purchased OREO	1,447	1,862
Total OREO	$ 6,178	$ 8,257