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Loans - Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial and industrial $ 4,772,617 $ 4,828,612 $ 4,309,889
Commercial mortgages 2,552,174 2,495,481  
Construction 588,743 608,306  
Land 230,351 216,008  
Total commercial real estate 3,371,268 3,319,795 3,119,902
Home equity loans 318,339 310,675  
Home equity lines of credit 193,464 186,522  
1-4 family residential mortgages 33,671 38,323  
Construction 13,654 17,621  
Other 226,077 224,206  
Total consumer real estate 785,205 777,347 762,060
Total real estate 4,156,473 4,097,142  
Consumer installment 318,824 311,310  
Other 6,498 8,435  
Total consumer and other 325,322 319,745 317,003
Unearned Discounts (21,869) (21,651) (19,091)
Total loans 9,232,543 9,223,848 8,489,763
Total commercial and industrial percentage of total loans 51.70% 52.30%  
Commercial mortgages percentage of total loans 27.60% 27.10%  
Construction percentage of total loans 6.40% 6.60%  
Land percentage of total loans 2.50% 2.30%  
Total commercial real estate percentage of total loans 36.50% 36.00%  
Home equity loans percentage of total loans 3.40% 3.40%  
Home equity lines of credit percentage of total loans 2.10% 2.00%  
1-4 family residential mortgages percentage of total loans 0.40% 0.40%  
Construction percentage of total loans 0.10% 0.20%  
Other percentage of total loans 2.50% 2.40%  
Total consumer real estate percentage of total loans 8.50% 8.40%  
Total real estate percentage of total loans 45.00% 44.40%  
Consumer installment percentage of total loans 3.40% 3.40%  
Other percentage of total loans 0.10% 0.10%  
Total consumer and other percentage of total loans 3.50% 3.50%  
Unearned discounts percentage of total loans (0.20%) (0.20%)  
Total loans percentage 100.00% 100.00%  
Commercial [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial and industrial 4,292,893 4,357,100  
Total commercial and industrial percentage of total loans 46.50% 47.20%  
Leases [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial and industrial 304,717 278,535  
Total commercial and industrial percentage of total loans 3.30% 3.00%  
Asset-based [Member]
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Commercial and industrial $ 175,007 $ 192,977  
Total commercial and industrial percentage of total loans 1.90% 2.10%