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Segment Information - Results of Operations and Selected Financial Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Net interest income (expense) $ 42,029 $ 40,256  
Noninterest income 23,562 22,535  
Income before taxes 20,537 20,547  
Total Assets 6,375,041 5,773,926 6,038,974
Operating Segments [Member] | Metropolitan Banks [Member]
      
Segment Reporting Information [Line Items]      
Net interest income (expense) 13,787 14,011  
Noninterest income 3,413 3,190  
Income before taxes 7,790 8,937  
Total Assets 2,093,563 1,926,511 2,079,444
Operating Segments [Member] | Community Banks [Member]
      
Segment Reporting Information [Line Items]      
Net interest income (expense) 27,241 25,144  
Noninterest income 12,266 11,545  
Income before taxes 15,077 14,077  
Total Assets 3,973,407 3,627,011 3,764,429
Operating Segments [Member] | Other Financial Services [Member]
      
Segment Reporting Information [Line Items]      
Net interest income (expense) 1,376 1,565  
Noninterest income 7,056 6,902  
Income before taxes 3,066 3,237  
Total Assets 113,732 109,887 103,656
Operating Segments [Member] | Executive, Operations & Support [Member]
      
Segment Reporting Information [Line Items]      
Net interest income (expense) (375) (464)  
Noninterest income 15,955 14,749  
Income before taxes 9,679 8,094  
Total Assets 816,489 690,318 703,294
Eliminations [Member]
      
Segment Reporting Information [Line Items]      
Net interest income (expense)       
Noninterest income (15,128) (13,851)  
Income before taxes (15,075) (13,798)  
Total Assets $ (622,150) $ (579,801) $ (611,849)