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Intangible Assets - Summary of Goodwill By Business Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Goodwill [Line Items]    
Balance at beginning of period $ 44,545 $ 44,545
Acquisitions 573  
Balance at end of period 45,118 44,545
Metropolitan Banks [Member]
    
Goodwill [Line Items]    
Balance at beginning of period 8,079  
Acquisitions     
Balance at end of period 8,079  
Community Banks [Member]
    
Goodwill [Line Items]    
Balance at beginning of period 30,552  
Acquisitions 573  
Balance at end of period 31,125  
Other Financial Services [Member]
    
Goodwill [Line Items]    
Balance at beginning of period 5,464  
Acquisitions     
Balance at end of period 5,464  
Executive, Operations & Support [Member]
    
Goodwill [Line Items]    
Balance at beginning of period 450  
Acquisitions     
Balance at end of period $ 450