XML 53 R39.htm IDEA: XBRL DOCUMENT v3.8.0.1
Nature of Business - Additional Information (Detail)
Dec. 31, 2017
Branches
Location
Dec. 31, 2016
Branches
Dec. 31, 2015
Branches
Entity Location [Line Items]      
Number of branches 342    
Net number of branches opened | Branches 3 8 31
Alabama [Member]      
Entity Location [Line Items]      
Number of branches 47    
Georgia [Member]      
Entity Location [Line Items]      
Number of branches 8    
New Mexico [Member]      
Entity Location [Line Items]      
Number of branches 18    
North Carolina [Member]      
Entity Location [Line Items]      
Number of branches 37    
Oklahoma [Member]      
Entity Location [Line Items]      
Number of branches 28    
South Carolina [Member]      
Entity Location [Line Items]      
Number of branches 68    
Tennessee [Member]      
Entity Location [Line Items]      
Number of branches 21    
Texas [Member]      
Entity Location [Line Items]      
Number of branches 98    
Virginia [Member]      
Entity Location [Line Items]      
Number of branches 17