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Business - Additional Information (Detail)
$ in Millions
Sep. 22, 2016
USD ($)
Branch
Sep. 30, 2016
Location
Subsidiary
Feb. 29, 2016
USD ($)
Schedule Of Description Of Company [Line Items]      
Number of inactive subsidiaries | Subsidiary   1  
Bank operated Business Financial Centers, number   42  
Bank operated Commercial Banking Centers, number   8  
Bank operated trust office locations, number   3  
County Commerce Bank [Member]      
Schedule Of Description Of Company [Line Items]      
Total assets of merger company | $     $ 253
Valley Business Bank [Member]      
Schedule Of Description Of Company [Line Items]      
Total assets of merger company | $ $ 416    
Number of bank branches acquired | Branch 4