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Business - Additional Information (Detail) $ in Millions	Mar. 10, 2017 USD ($) Branch	Sep. 30, 2017 Location Subsidiary
Schedule Of Description Of Company [Line Items]
Number of inactive subsidiaries \| Subsidiary		1
Bank operated banking centers, number		51
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