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Note 6 - Past Due Loans, Allowance For Credit Losses, and Impaired Loans (Detail) - Credit Quality Indicators by Class, Excluding Covered Loans (USD $)
In Thousands
Jun. 30, 2011
Dec. 31, 2010
Commercial And Industrial [Member] | Pass [Member]
   
Credit Quality Indicators by Class $ 1,337,553 $ 1,303,142
Commercial And Industrial [Member] | Special Mention [Member]
   
Credit Quality Indicators by Class 77,305 [1] 83,259 [1]
Commercial And Industrial [Member] | Substandard Accrual [Member]
   
Credit Quality Indicators by Class 59,521 [2] 29,414 [2]
Commercial And Industrial [Member] | Substandard Non Accrual [Member]
   
Credit Quality Indicators by Class 44,393 [3] 50,088 [3]
Commercial And Industrial [Member] | Total [Member]
   
Credit Quality Indicators by Class 1,518,772 1,465,903
Agricultural [Member] | Pass [Member]
   
Credit Quality Indicators by Class 223,260 209,317
Agricultural [Member] | Special Mention [Member]
   
Credit Quality Indicators by Class 13,249 [1] 15,667 [1]
Agricultural [Member] | Substandard Accrual [Member]
   
Credit Quality Indicators by Class   [2] 275 [2]
Agricultural [Member] | Substandard Non Accrual [Member]
   
Credit Quality Indicators by Class 1,009 [3] 2,497 [3]
Agricultural [Member] | Total [Member]
   
Credit Quality Indicators by Class 237,518 227,756
Office Retail And Industrial [Member] | Pass [Member]
   
Credit Quality Indicators by Class 1,058,059 1,026,124
Office Retail And Industrial [Member] | Special Mention [Member]
   
Credit Quality Indicators by Class 113,657 123,800 [1]
Office Retail And Industrial [Member] | Substandard Accrual [Member]
   
Credit Quality Indicators by Class 40,817 34,116 [2]
Office Retail And Industrial [Member] | Substandard Non Accrual [Member]
   
Credit Quality Indicators by Class 16,567 19,573 [3]
Office Retail And Industrial [Member] | Total [Member]
   
Credit Quality Indicators by Class 1,229,100 1,203,613
Multi Family [Member] | Pass [Member]
   
Credit Quality Indicators by Class 290,077 307,845
Multi Family [Member] | Special Mention [Member]
   
Credit Quality Indicators by Class 7,213 [1] 20,643 [1]
Multi Family [Member] | Substandard Accrual [Member]
   
Credit Quality Indicators by Class 15,463 [2] 15,171 [2]
Multi Family [Member] | Substandard Non Accrual [Member]
   
Credit Quality Indicators by Class 23,385 [3] 6,203 [3]
Multi Family [Member] | Total [Member]
   
Credit Quality Indicators by Class 336,138 349,862
Residential Construction [Member] | Pass [Member]
   
Credit Quality Indicators by Class 48,344 57,209
Residential Construction [Member] | Special Mention [Member]
   
Credit Quality Indicators by Class 27,305 [1] 35,950 [1]
Residential Construction [Member] | Substandard Accrual [Member]
   
Credit Quality Indicators by Class 30,102 [2] 29,409 [2]
Residential Construction [Member] | Substandard Non Accrual [Member]
   
Credit Quality Indicators by Class 23,576 [3] 52,122 [3]
Residential Construction [Member] | Total [Member]
   
Credit Quality Indicators by Class 129,327 174,690
Commercial Construction [Member] | Pass [Member]
   
Credit Quality Indicators by Class 72,237 85,305
Commercial Construction [Member] | Special Mention [Member]
   
Credit Quality Indicators by Class 34,291 [1] 35,750 [1]
Commercial Construction [Member] | Substandard Accrual [Member]
   
Credit Quality Indicators by Class 18,702 [2] 14,732 [2]
Commercial Construction [Member] | Substandard Non Accrual [Member]
   
Credit Quality Indicators by Class 21,449 [3] 28,685 [3]
Commercial Construction [Member] | Total [Member]
   
Credit Quality Indicators by Class 146,679 164,472
Other Commerical Real Estate [Member] | Pass [Member]
   
Credit Quality Indicators by Class 712,785 697,971
Other Commerical Real Estate [Member] | Special Mention [Member]
   
Credit Quality Indicators by Class 82,614 [1] 89,247 [1]
Other Commerical Real Estate [Member] | Substandard Accrual [Member]
   
Credit Quality Indicators by Class 20,583 [2] 28,534 [2]
Other Commerical Real Estate [Member] | Substandard Non Accrual [Member]
   
Credit Quality Indicators by Class 36,984 [3] 40,605 [3]
Other Commerical Real Estate [Member] | Total [Member]
   
Credit Quality Indicators by Class 852,966 856,357
Total Commercial Real Estate [Member] | Pass [Member]
   
Credit Quality Indicators by Class 2,181,502 2,174,454
Total Commercial Real Estate [Member] | Special Mention [Member]
   
Credit Quality Indicators by Class 265,080 [1] 305,390 [1]
Total Commercial Real Estate [Member] | Substandard Accrual [Member]
   
Credit Quality Indicators by Class 125,667 [2] 121,962 [2]
Total Commercial Real Estate [Member] | Substandard Non Accrual [Member]
   
Credit Quality Indicators by Class 121,961 [3] 147,188 [3]
Total Commercial Real Estate [Member] | Total [Member]
   
Credit Quality Indicators by Class 2,694,210 2,748,994
Total Corporate Loans [Member] | Pass [Member]
   
Credit Quality Indicators by Class 3,742,315 3,686,913
Total Corporate Loans [Member] | Special Mention [Member]
   
Credit Quality Indicators by Class 355,634 [1] 404,316 [1]
Total Corporate Loans [Member] | Substandard Accrual [Member]
   
Credit Quality Indicators by Class 185,188 [2] 151,651 [2]
Total Corporate Loans [Member] | Substandard Non Accrual [Member]
   
Credit Quality Indicators by Class 167,363 [3] 199,773 [3]
Total Corporate Loans [Member] | Total [Member]
   
Credit Quality Indicators by Class $ 4,450,500 $ 4,442,653
[1] Loans categorized as special mention have potential weaknesses that deserve the close attention of management. If left uncorrected, these potential weaknesses may result in the deterioration of repayment prospects or in the credit position of the Company at some future date.
[2] Loans categorized as substandard/accrual continue to accrue interest, but exhibit a well-defined weakness or weaknesses that may jeopardize the liquidation of the debt. These loans continue to accrue interest because they are well secured and collection of principal and interest is expected within a reasonable time.
[3] Loans categorized as substandard/non-accrual exhibit a well-defined weakness or weaknesses that may jeopardize the liquidation of the debt and are characterized by the distinct possibility that the Company could sustain some loss if the deficiencies are not corrected. These loans have been placed on non-accrual status.