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Segment Information - Results of Operations and Selected Financial Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Net interest income (expense) $ 49,976 $ 45,626  
Noninterest income 25,617 25,296  
Income before taxes 25,199 24,665  
Total Assets 6,740,938   $ 6,692,829
Operating Segments [Member] | Metropolitan Banks [Member]      
Segment Reporting Information [Line Items]      
Net interest income (expense) 15,843 15,400  
Noninterest income 3,788 3,457  
Income before taxes 9,348 9,889  
Total Assets 2,307,503   2,277,870
Operating Segments [Member] | Community Banks [Member]      
Segment Reporting Information [Line Items]      
Net interest income (expense) 33,122 29,055  
Noninterest income 13,596 12,326  
Income before taxes 19,094 16,407  
Total Assets 4,401,449   4,379,205
Operating Segments [Member] | Other Financial Services [Member]      
Segment Reporting Information [Line Items]      
Net interest income (expense) 1,416 1,618  
Noninterest income 7,479 8,727  
Income before taxes 3,114 5,007  
Total Assets 127,748   128,697
Operating Segments [Member] | Executive, Operations & Support [Member]      
Segment Reporting Information [Line Items]      
Net interest income (expense) (405) (447)  
Noninterest income 17,678 17,292  
Income before taxes 10,500 9,804  
Total Assets 628,843   624,428
Eliminations [Member]      
Segment Reporting Information [Line Items]      
Noninterest income (16,924) (16,506)  
Income before taxes (16,857) $ (16,442)  
Total Assets $ (724,605)   $ (717,371)