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Intangible Assets - Summary of Goodwill by Business Segment (Detail)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
USD ($)
Goodwill [Line Items]  
Balance at December 31, 2014 $ 44,962
Impairment (368)
Balance at June 30, 2015 44,594
Metropolitan Banks [Member]  
Goodwill [Line Items]  
Balance at December 31, 2014 8,078
Balance at June 30, 2015 8,078
Community Banks [Member]  
Goodwill [Line Items]  
Balance at December 31, 2014 30,970
Impairment (368)
Balance at June 30, 2015 30,602
Other Financial Services [Member]  
Goodwill [Line Items]  
Balance at December 31, 2014 5,464
Balance at June 30, 2015 5,464
Executive, Operations & Support [Member]  
Goodwill [Line Items]  
Balance at December 31, 2014 450
Balance at June 30, 2015 $ 450