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Nature of Business - Additional Information (Detail)
Jun. 30, 2018
Location
Branch
Entity Location [Line Items]  
Number of branches 340
Net number of branches consolidated | Branch 2
Alabama [Member]  
Entity Location [Line Items]  
Number of branches 46
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 36
Oklahoma [Member]  
Entity Location [Line Items]  
Number of branches 28
South Carolina [Member]  
Entity Location [Line Items]  
Number of branches 67
Tennessee [Member]  
Entity Location [Line Items]  
Number of branches 22
Texas [Member]  
Entity Location [Line Items]  
Number of branches 98
Virginia [Member]  
Entity Location [Line Items]  
Number of branches 17