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Intangible Assets - Summary of Goodwill by Business Segment (Detail)
$ in Thousands
Mar. 31, 2016
USD ($)
Goodwill [Line Items]  
Balance at December 31, 2015 $ 54,042
Balance at March 31, 2016 54,042
Metropolitan Banks [Member]  
Goodwill [Line Items]  
Balance at December 31, 2015 8,078
Balance at March 31, 2016 8,078
Community Banks [Member]  
Goodwill [Line Items]  
Balance at December 31, 2015 40,050
Balance at March 31, 2016 40,050
Other Financial Services [Member]  
Goodwill [Line Items]  
Balance at December 31, 2015 5,464
Balance at March 31, 2016 5,464
Executive, Operations & Support [Member]  
Goodwill [Line Items]  
Balance at December 31, 2015 450
Balance at March 31, 2016 $ 450