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Loans - Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial and industrial: $ 5,106,726 $ 4,907,076 $ 4,708,665
Commercial mortgages 2,800,091 2,800,760  
Construction 445,491 426,639  
Land 250,557 239,937  
Total commercial real estate 3,496,139 3,467,336 3,391,509
Home equity loans 334,802 329,853  
Home equity lines of credit 199,734 195,132  
1-4 family residential mortgages 29,749 32,447  
Construction 15,509 13,123  
Other 239,203 237,649  
Total consumer real estate 818,997 808,204 771,656
Total real estate 4,315,136 4,275,540  
Consumer installment 346,798 350,827  
Other 5,522 7,289  
Total consumer and other 352,320 358,116 311,348
Unearned discounts (23,537) (25,032) (20,827)
Total loans 9,750,645 9,515,700 9,162,351
Total commercial and industrial percentage of total loans 52.40% 51.60%  
Commercial mortgages percentage of total loans 28.70% 29.40%  
Construction percentage of total loans 4.60% 4.50%  
Land percentage of total loans 2.60% 2.50%  
Total commercial real estate percentage of total loans 35.90% 36.40%  
Home equity loans percentage of total loans 3.40% 3.50%  
Home equity lines of credit percentage of total loans 2.00% 2.10%  
1-4 family residential mortgages percentage of total loans 0.30% 0.30%  
Construction percentage of total loans 0.20% 0.10%  
Other percentage of total loans 2.50% 2.50%  
Total consumer real estate percentage of total loans 8.40% 8.50%  
Total real estate percentage of total loans 44.30% 44.90%  
Consumer installment percentage of total loans 3.50% 3.70%  
Other percentage of total loans 0.10% 0.10%  
Total consumer and other percentage of total loans 3.60% 3.80%  
Unearned discounts percentage of total loans (0.30%) (0.30%)  
Total loans percentage 100.00% 100.00%  
Commercial [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial and industrial: 4,686,817 4,460,543  
Total commercial and industrial percentage of total loans 48.10% 46.90%  
Leases [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial and industrial: 307,269 319,577  
Total commercial and industrial percentage of total loans 3.10% 3.40%  
Asset-based [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial and industrial: $ 112,640 $ 126,956  
Total commercial and industrial percentage of total loans 1.20% 1.30%