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Subsequent Events (Details) - USD ($)
$ in Thousands
Mar. 03, 2017
Dec. 31, 2016
Dec. 31, 2015
Subsequent Event [Line Items]      
Total assets   $ 3,614,862 $ 3,362,065
Carolina Bank [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Total purchase price $ 25,300    
Total assets $ 705,000