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Fair Value Measurements, Financial Instruments (Details) (USD $)
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Dec. 31, 2010
Investment securities [Abstract]            
Total investment securities $ 432,114,000 [1]   $ 439,236,000 [2] $ 452,652,000 [3]    
Fair Value Option Securities [Abstract]            
Residential mortgage loans held for sale 325,102,000   188,125,000 256,397,000    
Loans [Abstract]            
Total 11,832,367,000   11,269,743,000 11,124,569,000    
Allowance for loan losses (233,756,000) (231,669,000) (253,481,000) (271,456,000) (286,611,000) (292,971,000)
Loans, net of allowance 11,598,611,000   11,016,262,000 10,853,113,000    
Mortgage servicing rights, Fair Value Disclosure 89,653,000 91,783,000 86,783,000 87,948,000 109,192,000 115,723,000
Derivative contracts net of cash margin, assets, Fair Value Disclosure 435,653,000   293,859,000 370,616,000    
Time deposits 3,022,326,000   3,381,982,000 3,554,470,000    
Subordinated debentures 347,592,000   398,881,000 398,834,000    
Derivative contracts net of cash margin, liabilities, Fair Value DIsclosure 254,422,000   653,371,000 341,822,000    
Carrying (Reported) Amount, Fair Value Disclosure [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and cash equivalents 615,494,000   986,365,000 972,881,000    
Trading Securities [Abstract]            
U.S. Agency Government Obligations, Trading Securities, Fair Value Disclosure 3,100,000   22,203,000 1,839,000    
U.S. Agency Residential Mortgage-backed Securities, Trading Securities, Fair Value Disclosure 119,835,000   12,379,000 49,501,000    
Municipal And Other-tax Exempt Securities, Trading Securities, Fair Value Disclosure 58,150,000   39,345,000 57,431,000    
Other Trading Securities, Trading Securities, Fair Value Disclosure 23,157,000   2,873,000 888,000    
Trading Securities, Fair Value Disclosure 204,242,000   76,800,000 109,659,000    
Investment securities [Abstract]            
Municipal and other tax-exempt 155,144,000   128,697,000 133,394,000    
U.S. agency residential mortgage-backed securities 91,911,000   121,704,000 130,668,000    
Other debt securities 185,059,000   188,835,000 188,590,000    
Total investment securities 432,114,000   439,236,000 452,652,000    
Available for sale securities [Abstract]            
U.S. Treasury Securities, Available for Sale Securities, Fair Value DIsclosure 1,002,000   1,006,000 1,006,000    
Municipal and Other Tax-exempt Securities, Available for Sale Securities, Fair Value Disclosure 87,969,000   68,837,000 70,195,000    
U.S. Agency Residential Mortgage-backed Securities. Available for Sale Securities, Fair Value Disclosure 10,654,821,000   9,588,177,000 9,016,877,000    
Privately Issued Residential Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 331,722,000   419,166,000 457,332,000    
Commercial Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 339,095,000          
Other Debt Securities, Available for Sale Securities, Fair Value Disclosure 36,456,000   36,495,000 5,900,000    
Perpetual Preferred Stock, Available for Sale Securities, Fair Value Disclosure 25,288,000   18,446,000 19,080,000    
Equity Securities and Mutual Funds, Available for Sale Securities, Fair Value Disclosure 30,081,000   47,238,000 49,241,000    
Available for Sale Securities, Fair Value Disclosure 11,506,434,000   10,179,365,000 9,619,631,000    
Fair Value Option Securities [Abstract]            
U.S. Agency Residential Mortgage-backed Securities, Fair Value Option Securities, Fair Value Disclosure 305,445,000   626,109,000 672,191,000    
Corporate Debt Securities, Fair Value Option Securities, Fair Value Disclosure 26,442,000   25,117,000 0    
Fair Value Option Securities, Fair Value Disclosure 331,887,000   651,226,000 672,191,000    
Residential mortgage loans held for sale 325,102,000   188,125,000 256,397,000    
Loans [Abstract]            
Commercial 7,273,217,000   6,571,454,000 6,475,689,000    
Commercial real estate 2,165,526,000   2,279,909,000 2,259,902,000    
Residential mortgage 2,018,980,000   1,970,461,000 1,911,896,000    
Consumer 374,644,000   447,919,000 477,082,000    
Total 11,832,367,000   11,269,743,000 11,124,569,000    
Allowance for loan losses (233,756,000)   (253,481,000) (271,456,000)    
Loans, net of allowance 11,598,611,000   11,016,262,000 10,853,113,000    
Mortgage servicing rights, Fair Value Disclosure 89,653,000   86,783,000 87,948,000    
Derivative contracts net of cash margin, assets, Fair Value Disclosure 472,783,000   293,859,000 370,616,000    
Other assets - private equity funds 28,791,000   30,902,000 29,113,000    
Deposits with no stated maturity 16,120,541,000   15,380,598,000 14,884,552,000    
Time deposits 3,022,326,000   3,381,982,000 3,554,470,000    
Other borrowings 3,429,575,000   2,370,867,000 2,605,737,000    
Subordinated debentures 347,592,000   398,881,000 398,834,000    
Derivative contracts net of cash margin, liabilities, Fair Value DIsclosure 435,497,000   236,522,000 341,822,000    
Estimate of Fair Value, Fair Value Disclosure [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and cash equivalents 615,494,000   986,365,000 972,881,000    
Trading Securities [Abstract]            
U.S. Agency Government Obligations, Trading Securities, Fair Value Disclosure 3,100,000   22,203,000 1,839,000    
U.S. Agency Residential Mortgage-backed Securities, Trading Securities, Fair Value Disclosure 119,835,000   12,379,000 49,501,000    
Municipal And Other-tax Exempt Securities, Trading Securities, Fair Value Disclosure 58,150,000   39,345,000 57,431,000    
Other Trading Securities, Trading Securities, Fair Value Disclosure 23,157,000   2,873,000 888,000    
Trading Securities, Fair Value Disclosure 204,242,000   76,800,000 109,659,000    
Investment securities [Abstract]            
Municipal and other tax-exempt 159,464,000   133,670,000 138,461,000    
U.S. agency residential mortgage-backed securities 95,128,000   120,536,000 130,614,000    
Other debt securities 205,766,000   208,451,000 214,159,000    
Total investment securities 460,358,000   462,657,000 483,234,000    
Available for sale securities [Abstract]            
U.S. Treasury Securities, Available for Sale Securities, Fair Value DIsclosure 1,002,000   1,006,000 1,006,000    
Municipal and Other Tax-exempt Securities, Available for Sale Securities, Fair Value Disclosure 87,969,000   68,837,000 70,195,000    
U.S. Agency Residential Mortgage-backed Securities. Available for Sale Securities, Fair Value Disclosure 10,654,821,000   9,588,177,000 9,016,877,000    
Privately Issued Residential Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 331,722,000   419,166,000 457,332,000    
Commercial Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 339,095,000          
Other Debt Securities, Available for Sale Securities, Fair Value Disclosure 36,456,000   36,495,000 5,900,000    
Perpetual Preferred Stock, Available for Sale Securities, Fair Value Disclosure 25,288,000   18,446,000 19,080,000    
Equity Securities and Mutual Funds, Available for Sale Securities, Fair Value Disclosure 30,081,000   47,238,000 49,241,000    
Available for Sale Securities, Fair Value Disclosure 11,506,434,000   10,179,365,000 9,619,631,000    
Fair Value Option Securities [Abstract]            
U.S. Agency Residential Mortgage-backed Securities, Fair Value Option Securities, Fair Value Disclosure 305,445,000   626,109,000 672,191,000    
Corporate Debt Securities, Fair Value Option Securities, Fair Value Disclosure 26,442,000   25,117,000 0    
Fair Value Option Securities, Fair Value Disclosure 331,887,000   651,226,000 672,191,000    
Residential mortgage loans held for sale 325,102,000   188,125,000 256,397,000    
Loans [Abstract]            
Commercial 7,232,761,000   6,517,795,000 6,406,679,000    
Commercial real estate 2,142,239,000   2,267,375,000 2,227,367,000    
Residential mortgage 2,084,251,000   2,034,898,000 1,984,949,000    
Consumer 368,546,000   436,490,000 477,058,000    
Total 11,827,797,000   11,256,558,000 11,096,053,000    
Allowance for loan losses 0   0 0    
Loans, net of allowance 11,827,797,000   11,256,558,000 11,096,053,000    
Mortgage servicing rights, Fair Value Disclosure 89,653,000   86,783,000 87,948,000    
Derivative contracts net of cash margin, assets, Fair Value Disclosure 472,783,000   293,859,000 370,616,000    
Other assets - private equity funds 28,791,000   30,902,000 29,113,000    
Deposits with no stated maturity 16,120,541,000   15,380,598,000 14,884,552,000    
Time deposits 3,099,183,000   3,441,610,000 3,620,327,000    
Other borrowings 3,420,135,000   2,369,224,000 2,605,739,000    
Subordinated debentures 345,852,000   411,243,000 413,701,000    
Derivative contracts net of cash margin, liabilities, Fair Value DIsclosure 435,497,000   236,522,000 341,822,000    
Contractual Yield, Minimum [Member]
            
Loans [Abstract]            
Commercial 0.0025   0.0025 0.0025    
Commercial real estate 0.0038   0.0038 0.0038    
Residential mortgage 0.0038   0.0038 0.0038    
Consumer 0.0038   0.0038 0.0038    
Time deposits 0.0001   0.0001 0.0001    
Other borrowings 0.0009   0.0025 0.0025    
Subordinated debentures 0.0112   0.0519 0.0519    
Contractual Yield, Maximum [Member]
            
Loans [Abstract]            
Commercial 0.3000   0.3000 0.3000    
Commercial real estate 0.1800   0.1800 0.1800    
Residential mortgage 0.1800   0.1800 0.1800    
Consumer 0.2100   0.2100 0.2100    
Time deposits 0.0964   0.0964 0.0964    
Other borrowings 0.0525   0.0658 0.0658    
Subordinated debentures 0.0500   0.0582 0.0582    
Average Repricing [Member]
            
Loans [Abstract]            
Commercial 0.64   0.57 0.56    
Commercial real estate 0.93   1.26 1.23    
Residential mortgage 3.31   3.26 3.24    
Consumer 0.32   0.42 0.48    
Time deposits 2.14   2.07 2.02    
Other borrowings 0.00   0.00 0.00    
Subordinated debentures 3.79   1.44 1.67    
Discount Rate, Minimum [Member]
            
Loans [Abstract]            
Commercial 0.0058   0.0063 0.0064    
Commercial real estate 0.0130   0.0028 0.0028    
Residential mortgage 0.0099   0.0114 0.0088    
Consumer 0.0143   0.0188 0.0190    
Time deposits 0.0085   0.0102 0.0087    
Other borrowings 0.0009   0.0004 0.0006    
Discount Rate, Maximum [Member]
            
Loans [Abstract]            
Commercial 0.0350   0.0385 0.0381    
Commercial real estate 0.0317   0.0351 0.0339    
Residential mortgage 0.0317   0.0370 0.0378    
Consumer 0.0369   0.0388 0.0368    
Time deposits 0.0115   0.0143 0.0128    
Other borrowings 0.0267   0.0276 0.0324    
Subordinated debentures 0.0226   0.0329 0.0324    
Fair Value, Measurements, Recurring [Member]
            
Trading Securities [Abstract]            
U.S. Agency Government Obligations, Trading Securities, Fair Value Disclosure 3,100,000   22,203,000 1,839,000    
U.S. Agency Residential Mortgage-backed Securities, Trading Securities, Fair Value Disclosure 119,835,000   12,379,000 49,501,000    
Municipal And Other-tax Exempt Securities, Trading Securities, Fair Value Disclosure 58,150,000   39,345,000 57,431,000    
Other Trading Securities, Trading Securities, Fair Value Disclosure 23,157,000   2,873,000 888,000    
Trading Securities, Fair Value Disclosure 204,242,000   76,800,000 109,659,000    
Available for sale securities [Abstract]            
U.S. Treasury Securities, Available for Sale Securities, Fair Value DIsclosure 1,002,000   1,006,000 1,006,000    
Municipal and Other Tax-exempt Securities, Available for Sale Securities, Fair Value Disclosure 87,969,000   68,837,000 70,195,000    
U.S. Agency Residential Mortgage-backed Securities. Available for Sale Securities, Fair Value Disclosure 10,654,821,000   9,588,177,000 9,016,877,000    
Privately Issued Residential Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 331,722,000   419,166,000 457,332,000    
Commercial Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 339,095,000          
Other Debt Securities, Available for Sale Securities, Fair Value Disclosure 36,456,000   36,495,000 5,900,000    
Perpetual Preferred Stock, Available for Sale Securities, Fair Value Disclosure 25,288,000   18,446,000 19,080,000    
Equity Securities and Mutual Funds, Available for Sale Securities, Fair Value Disclosure 30,081,000   47,238,000 49,241,000    
Available for Sale Securities, Fair Value Disclosure 11,506,434,000   10,179,365,000 9,619,631,000    
Fair Value Option Securities [Abstract]            
U.S. Agency Residential Mortgage-backed Securities, Fair Value Option Securities, Fair Value Disclosure 305,445,000   626,109,000 672,191,000    
Corporate Debt Securities, Fair Value Option Securities, Fair Value Disclosure 26,442,000   25,117,000 0    
Fair Value Option Securities, Fair Value Disclosure 331,887,000   651,226,000 672,191,000    
Loans [Abstract]            
Mortgage servicing rights, Fair Value Disclosure 89,653,000 [4]   86,783,000 [4] 87,948,000 [4]    
Derivative contracts net of cash margin, assets, Fair Value Disclosure 472,783,000 [5]   293,859,000 [5] 370,616,000 [5]    
Other assets - private equity funds, Fair Value Disclosure 28,792,000   30,902,000 29,113,000    
Derivative contracts net of cash margin, liabilities, Fair Value DIsclosure 435,497,000 [5]   236,522,000 [5] 341,822,000 [5]    
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
            
Trading Securities [Abstract]            
U.S. Agency Government Obligations, Trading Securities, Fair Value Disclosure 0   0 0    
U.S. Agency Residential Mortgage-backed Securities, Trading Securities, Fair Value Disclosure 0   0 0    
Municipal And Other-tax Exempt Securities, Trading Securities, Fair Value Disclosure 0   0 0    
Other Trading Securities, Trading Securities, Fair Value Disclosure 0   0 888,000    
Trading Securities, Fair Value Disclosure 0   0 888,000    
Available for sale securities [Abstract]            
U.S. Treasury Securities, Available for Sale Securities, Fair Value DIsclosure 1,002,000   1,006,000 1,006,000    
Municipal and Other Tax-exempt Securities, Available for Sale Securities, Fair Value Disclosure 0   0 0    
U.S. Agency Residential Mortgage-backed Securities. Available for Sale Securities, Fair Value Disclosure 0   0 0    
Privately Issued Residential Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 0   0 0    
Commercial Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 0          
Other Debt Securities, Available for Sale Securities, Fair Value Disclosure 0   0 0    
Perpetual Preferred Stock, Available for Sale Securities, Fair Value Disclosure 0   0 0    
Equity Securities and Mutual Funds, Available for Sale Securities, Fair Value Disclosure 7,837,000   23,596,000 29,827,000    
Available for Sale Securities, Fair Value Disclosure 8,839,000   24,602,000 30,833,000    
Fair Value Option Securities [Abstract]            
U.S. Agency Residential Mortgage-backed Securities, Fair Value Option Securities, Fair Value Disclosure 0   0 0    
Corporate Debt Securities, Fair Value Option Securities, Fair Value Disclosure 0   0 0    
Fair Value Option Securities, Fair Value Disclosure 0   0 0    
Loans [Abstract]            
Mortgage servicing rights, Fair Value Disclosure 0 [4]   0 [4] 0 [4]    
Derivative contracts net of cash margin, assets, Fair Value Disclosure 8,301,000 [5],[6]   457,000 [5] 34,770,000 [5],[7]    
Other assets - private equity funds, Fair Value Disclosure 0   0 0    
Derivative contracts net of cash margin, liabilities, Fair Value DIsclosure 0 [5]   0 [5] 0 [5]    
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
            
Trading Securities [Abstract]            
U.S. Agency Government Obligations, Trading Securities, Fair Value Disclosure 3,100,000   22,203,000 1,839,000    
U.S. Agency Residential Mortgage-backed Securities, Trading Securities, Fair Value Disclosure 119,835,000   12,379,000 49,501,000    
Municipal And Other-tax Exempt Securities, Trading Securities, Fair Value Disclosure 58,150,000   39,345,000 57,431,000    
Other Trading Securities, Trading Securities, Fair Value Disclosure 23,157,000   2,696,000 0    
Trading Securities, Fair Value Disclosure 204,242,000   76,623,000 108,771,000    
Available for sale securities [Abstract]            
U.S. Treasury Securities, Available for Sale Securities, Fair Value DIsclosure 0   0 0    
Municipal and Other Tax-exempt Securities, Available for Sale Securities, Fair Value Disclosure 46,690,000   26,484,000 26,483,000    
U.S. Agency Residential Mortgage-backed Securities. Available for Sale Securities, Fair Value Disclosure 10,654,821,000   9,588,177,000 9,016,877,000    
Privately Issued Residential Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 331,722,000   419,166,000 457,332,000    
Commercial Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 339,095,000          
Other Debt Securities, Available for Sale Securities, Fair Value Disclosure 31,056,000   30,595,000 0    
Perpetual Preferred Stock, Available for Sale Securities, Fair Value Disclosure 25,288,000   18,446,000 19,080,000    
Equity Securities and Mutual Funds, Available for Sale Securities, Fair Value Disclosure 22,244,000   23,642,000 19,414,000    
Available for Sale Securities, Fair Value Disclosure 11,450,916,000   10,106,510,000 9,539,186,000    
Fair Value Option Securities [Abstract]            
U.S. Agency Residential Mortgage-backed Securities, Fair Value Option Securities, Fair Value Disclosure 305,445,000   626,109,000 672,191,000    
Corporate Debt Securities, Fair Value Option Securities, Fair Value Disclosure 26,442,000   25,117,000 0    
Fair Value Option Securities, Fair Value Disclosure 331,887,000   651,226,000 672,191,000    
Loans [Abstract]            
Mortgage servicing rights, Fair Value Disclosure 0 [4]   0 [4] 0 [4]    
Derivative contracts net of cash margin, assets, Fair Value Disclosure 464,482,000 [5]   293,402,000 [5] 335,846,000 [5]    
Other assets - private equity funds, Fair Value Disclosure 0   0 0    
Derivative contracts net of cash margin, liabilities, Fair Value DIsclosure 435,497,000 [5]   236,522,000 [5] 341,822,000 [5]    
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
            
Trading Securities [Abstract]            
U.S. Agency Government Obligations, Trading Securities, Fair Value Disclosure 0   0 0    
U.S. Agency Residential Mortgage-backed Securities, Trading Securities, Fair Value Disclosure 0   0 0    
Municipal And Other-tax Exempt Securities, Trading Securities, Fair Value Disclosure 0   0 0    
Other Trading Securities, Trading Securities, Fair Value Disclosure 0   177,000 0    
Trading Securities, Fair Value Disclosure 0   177,000 0    
Available for sale securities [Abstract]            
U.S. Treasury Securities, Available for Sale Securities, Fair Value DIsclosure 0   0 0    
Municipal and Other Tax-exempt Securities, Available for Sale Securities, Fair Value Disclosure 41,279,000   42,353,000 43,712,000    
U.S. Agency Residential Mortgage-backed Securities. Available for Sale Securities, Fair Value Disclosure 0   0 0    
Privately Issued Residential Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 0   0 0    
Commercial Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 0          
Other Debt Securities, Available for Sale Securities, Fair Value Disclosure 5,400,000   5,900,000 5,900,000    
Perpetual Preferred Stock, Available for Sale Securities, Fair Value Disclosure 0   0 0    
Equity Securities and Mutual Funds, Available for Sale Securities, Fair Value Disclosure 0   0 0    
Available for Sale Securities, Fair Value Disclosure 46,679,000   48,253,000 49,612,000    
Fair Value Option Securities [Abstract]            
U.S. Agency Residential Mortgage-backed Securities, Fair Value Option Securities, Fair Value Disclosure 0   0 0    
Corporate Debt Securities, Fair Value Option Securities, Fair Value Disclosure 0   0 0    
Fair Value Option Securities, Fair Value Disclosure 0   0 0    
Loans [Abstract]            
Mortgage servicing rights, Fair Value Disclosure 89,653,000 [4]   86,783,000 [4] 87,948,000 [4]    
Derivative contracts net of cash margin, assets, Fair Value Disclosure 0 [5]   0 [5] 0 [5]    
Other assets - private equity funds, Fair Value Disclosure 28,792,000   30,902,000 29,113,000    
Derivative contracts net of cash margin, liabilities, Fair Value DIsclosure $ 0 [5]   $ 0 [5] $ 0 [5]    
[1] Carrying value includes $6.2 million of net unrealized gain which remains in Accumulated other comprehensive income (“AOCI”) related to certain securities transferred from the Available for Sale securities portfolio to the Investment securities portfolio as discussed in greater detail following.
[2] Carrying value includes $12 million of net unrealized gain which remains in Accumulated other comprehensive income (“AOCI”) in the Consolidated Balance Sheets related to certain securities transferred from the Available for Sale securities portfolio to the Investment securities portfolio as discussed in greater detail following.
[3] Carrying value includes $13 million of net unrealized gain which remains in Accumulated other comprehensive income (“AOCI”) in the Consolidated Balance Sheets related to certain securities transferred from the Available for Sale securities portfolio to the Investment securities portfolio as discussed in greater detail following.
[4] A reconciliation of the beginning and ending fair value of mortgage servicing rights and disclosures of significant assumptions used to determine fair value are presented in Note 6, Mortgage Banking Activities.
[5] See Note 3 for detail of fair value of derivative contracts by contract type.
[6] Represents exchange-traded energy derivative contracts.
[7] Represents exchange-traded energy derivative contracts