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Segment Information - Results of Operations and Selected Financial Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Segment Reporting Information [Line Items]          
Net interest income (expense) $ 40,712 $ 40,832 $ 121,598 $ 122,518  
Noninterest income 23,652 22,116 67,920 65,917  
Income before taxes 21,055 20,250 60,994 60,716  
Total Assets 5,926,730 5,836,751 5,926,730 5,836,751 6,022,250
Operating Segments [Member] | Metropolitan Banks [Member]
          
Segment Reporting Information [Line Items]          
Net interest income (expense) 14,043 13,267 41,997 39,784  
Noninterest income 3,213 2,840 9,519 8,193  
Income before taxes 9,173 8,302 26,218 24,954  
Total Assets 2,031,194 1,892,444 2,031,194 1,892,444 1,996,539
Operating Segments [Member] | Community Banks [Member]
          
Segment Reporting Information [Line Items]          
Net interest income (expense) 25,613 26,302 76,181 79,317  
Noninterest income 12,750 11,153 36,141 32,009  
Income before taxes 15,229 15,234 43,818 45,433  
Total Assets 3,723,491 3,745,727 3,723,491 3,745,727 3,801,653
Operating Segments [Member] | Other Financial Services [Member]
          
Segment Reporting Information [Line Items]          
Net interest income (expense) 1,491 1,777 4,786 5,211  
Noninterest income 6,864 7,404 19,839 23,482  
Income before taxes 2,619 3,266 8,014 11,664  
Total Assets 120,476 126,704 120,476 126,704 186,473
Operating Segments [Member] | Executive, Operations and Support [Member]
          
Segment Reporting Information [Line Items]          
Net interest income (expense) (435) (514) (1,366) (1,794)  
Noninterest income 15,651 14,881 44,192 43,507  
Income before taxes 8,688 7,463 24,425 19,682  
Total Assets 647,336 636,853 647,336 636,853 602,342
Eliminations [Member]
          
Segment Reporting Information [Line Items]          
Net interest income (expense)              
Noninterest income (14,826) (14,162) (41,771) (41,274)  
Income before taxes (14,654) (14,015) (41,481) (41,017)  
Total Assets $ (595,767) $ (564,977) $ (595,767) $ (564,977) $ (564,757)