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Changes in Goodwill, by Reporting Unit (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Line Items]      
Beginning balance, January 1, $ 100,486 $ 100,722 $ 105,455
Acquisitions and dispositions, net (4,707) (324) (6,454)
Cash consideration paid   88 1,721
Ending balance, December 31, 95,779 100,486 100,722
Community Banking      
Goodwill [Line Items]      
Beginning balance, January 1, 91,455 91,455 96,541
Acquisitions and dispositions, net 1,290   (6,454)
Other [1] 3,034    
Cash consideration paid     1,368
Ending balance, December 31, 95,779 91,455 91,455
Insurance Services      
Goodwill [Line Items]      
Beginning balance, January 1, 9,031 9,267 8,914
Acquisitions and dispositions, net (5,997) (324)  
Other [1] $ (3,034)    
Cash consideration paid   88 353
Ending balance, December 31,   $ 9,031 $ 9,267
[1] Represents the transfer of goodwill after the sale of Greenpoint to one reporting unit