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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Results of operations and selected financial information      
Net interest income (expense) $ 40,256 $ 40,817  
Noninterest income 22,535 23,437  
Income before taxes 20,547 22,044  
Total assets 5,773,926 5,737,994 6,022,250
Metropolitan Banks [Member]
      
Results of operations and selected financial information      
Net interest income (expense) 14,011 13,163  
Noninterest income 3,190 2,681  
Income before taxes 8,937 8,432  
Total assets 1,926,511 1,809,836 1,996,539
Community Banks [Member]
      
Results of operations and selected financial information      
Net interest income (expense) 25,144 26,631  
Noninterest income 11,545 10,135  
Income before taxes 14,077 15,255  
Total assets 3,627,011 3,760,533 3,801,653
Other Financial Services [Member]
      
Results of operations and selected financial information      
Net interest income (expense) 1,565 1,713  
Noninterest income 6,902 9,864  
Income before taxes 3,237 6,387  
Total assets 109,887 139,114 186,473
Executive, Operations and Support [Member]
      
Results of operations and selected financial information      
Net interest income (expense) (464) (690)  
Noninterest income 14,749 15,381  
Income before taxes 8,094 6,533  
Total assets 690,318 590,597 602,342
Eliminations [Member]
      
Results of operations and selected financial information      
Noninterest income (13,851) (14,624)  
Income before taxes (13,798) (14,563)  
Total assets $ (579,801) $ (562,086) $ (564,757)