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Business - Additional Information (Detail) $ / shares in Units, $ in Millions	Feb. 26, 2018 USD ($) $ / shares	Jun. 30, 2018 USD ($) Location Subsidiary
Schedule Of Description Of Company [Line Items]
Number of inactive subsidiaries | Subsidiary		1
Bank operated banking centers, number | Location		51
Bank operated trust office locations, number | Location		3
Stock price | $ / shares	$ 23.60
Community Bank [Member]
Schedule Of Description Of Company [Line Items]
Total assets		$ 3,710.0
Gross loans		2,790.0
Total deposits		$ 2,860.0
Number of share to be received in respect of each share of common stock	9.4595
Amount of cash paid per share | $ / shares	$ 56.00
Merger transaction value	$ 885.2

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