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Business - Additional Information (Detail)
$ / shares in Units, $ in Millions
Feb. 26, 2018
USD ($)
$ / shares
Mar. 31, 2018
Location
Subsidiary
Dec. 31, 2017
USD ($)
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     $ 3,750.0
Gross loans     2,740.0
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