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Business - Additional Information (Detail)
$ in Millions
Mar. 10, 2017
USD ($)
Branch
Mar. 31, 2017
Location
Subsidiary
Schedule Of Description Of Company [Line Items]    
Number of inactive subsidiaries | Subsidiary   1
Bank operated banking centers, number   54
Bank operated trust office locations, number   3
Valley Commerce Bancorp [Member]    
Schedule Of Description Of Company [Line Items]    
Total assets of acquired/merger company | $ $ 400  
Number of bank branches acquired | Branch 4