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Fair Value Measurements, Financial Instruments (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Investment securities [Abstract]        
Total investment securities $ 499,534,000 [1] $ 439,236,000 [2]    
Fair Value Option Securities [Abstract]        
Residential mortgage loans held for sale 293,762,000 188,125,000    
Loans [Abstract]        
Allowance for loan losses (215,507,000) (253,481,000) (292,971,000) (292,095,000)
Loans, net of allowance 12,095,949,000 11,016,262,000    
Mortgage servicing rights, Fair Value Disclosure 100,812,000 86,783,000 115,723,000 73,824,000
Derivative contracts net of cash margin, assets, Fair Value Disclosure 338,106,000 293,859,000    
Time deposits 2,967,992,000 3,381,982,000    
Subordinated debentures 347,633,000 398,881,000    
Derivative contracts net of cash margin, liabilities, Fair Value DIsclosure 283,589,000 236,522,000    
Total 12,311,456,000 11,269,743,000    
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]        
Specific allocation of allowance for loan losses included in fair value of loans 171,000,000 207,000,000    
Carrying (Reported) Amount, Fair Value Disclosure [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 1,286,239,000 986,365,000    
Trading Securities [Abstract]        
U.S. Government Agency Obligations, Trading Securities, Fair Value Disclosure 16,545,000 22,203,000    
U.S. Agency Residential Mortgage-backed Securities, Trading Securities, Fair Value Disclosure 86,361,000 12,379,000    
Municipal And Other-tax Exempt Securities, Trading Securities, Fair Value Disclosure 90,326,000 39,345,000    
Other Trading Securities, Trading Securities, Fair Value Disclosure 20,870,000 2,873,000    
Trading Securities, Fair Value Disclosure 214,102,000 76,800,000    
Investment securities [Abstract]        
Municipal and other tax-exempt 232,700,000 128,697,000    
U.S. agency residential mortgage-backed securities 82,767,000 121,704,000    
Other debt securities 184,067,000 188,835,000    
Total investment securities 499,534,000 439,236,000    
Available for sale securities [Abstract]        
U.S. Treasury, Available for Sale Securities, Fair Value DIsclosure 1,002,000 1,006,000    
Municipal and Other Tax-exempt, Available for Sale Securities, Fair Value Disclosure 87,142,000 68,837,000    
U.S. Agency Residential Mortgage-backed Securities. Available for Sale Securities, Fair Value Disclosure 9,889,821,000 9,588,177,000    
Privately Issued Residential Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 325,163,000 419,166,000    
Commercial Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 895,075,000      
Other Debt Securities, Available for Sale Securities, Fair Value Disclosure 36,389,000 36,495,000    
Perpetual Preferred Stock, Available for Sale Securities, Fair Value Disclosure 25,072,000 18,446,000    
Equity Securities and Mutual Funds, Available for Sale Securities, Fair Value Disclosure 27,557,000 47,238,000    
Available for Sale Securities, Fair Value Disclosure 11,287,221,000 10,179,365,000    
Fair Value Option Securities [Abstract]        
U.S. Agency Residential Mortgage-backed Securities, Fair Value Option Securities, Fair Value Disclosure 257,040,000 626,109,000    
Corporate Debt Securities, Fair Value Option Securities, Fair Value Disclosure 26,486,000 25,117,000    
Other Debt Securities, Fair Value Option Securities, Fair Value Disclosure 770,000      
Fair Value Option Securities, Fair Value Disclosure 284,296,000 651,226,000    
Residential mortgage loans held for sale 293,762,000 188,125,000    
Loans [Abstract]        
Allowance for loan losses (215,507,000) (253,481,000)    
Loans, net of allowance 12,095,949,000 11,016,262,000    
Mortgage servicing rights, Fair Value Disclosure 100,812,000 86,783,000    
Derivative contracts net of cash margin, assets, Fair Value Disclosure 338,106,000 293,859,000    
Other assets - private equity funds, Fair Value Disclosure 28,169,000 30,902,000    
Deposits with no stated maturity 18,211,068,000 15,380,598,000    
Time deposits 2,967,992,000 3,381,982,000    
Other borrowings 2,706,221,000 2,370,867,000    
Subordinated debentures 347,633,000 398,881,000    
Derivative contracts net of cash margin, liabilities, Fair Value DIsclosure 283,589,000 236,522,000    
Commercial 7,641,912,000 6,571,454,000    
Commercial real estate 2,228,999,000 2,279,909,000    
Residential mortgage 2,045,040,000 1,970,461,000    
Consumer 395,505,000 447,919,000    
Total 12,311,456,000 11,269,743,000    
Estimate of Fair Value, Fair Value Disclosure [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 1,286,239,000 986,365,000    
Trading Securities [Abstract]        
U.S. Government Agency Obligations, Trading Securities, Fair Value Disclosure 16,545,000 22,203,000    
U.S. Agency Residential Mortgage-backed Securities, Trading Securities, Fair Value Disclosure 86,361,000 12,379,000    
Municipal And Other-tax Exempt Securities, Trading Securities, Fair Value Disclosure 90,326,000 39,345,000    
Other Trading Securities, Trading Securities, Fair Value Disclosure 20,870,000 2,873,000    
Trading Securities, Fair Value Disclosure 214,102,000 76,800,000    
Investment securities [Abstract]        
Municipal and other tax-exempt 235,940,000 133,670,000    
U.S. agency residential mortgage-backed securities 85,943,000 120,536,000    
Other debt securities 206,575,000 208,451,000    
Total investment securities 528,458,000 462,657,000    
Available for sale securities [Abstract]        
U.S. Treasury, Available for Sale Securities, Fair Value DIsclosure 1,002,000 1,006,000    
Municipal and Other Tax-exempt, Available for Sale Securities, Fair Value Disclosure 87,142,000 68,837,000    
U.S. Agency Residential Mortgage-backed Securities. Available for Sale Securities, Fair Value Disclosure 9,889,821,000 9,588,177,000    
Privately Issued Residential Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 325,163,000 419,166,000    
Commercial Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 895,075,000      
Other Debt Securities, Available for Sale Securities, Fair Value Disclosure 36,389,000 36,495,000    
Perpetual Preferred Stock, Available for Sale Securities, Fair Value Disclosure 25,072,000 18,446,000    
Equity Securities and Mutual Funds, Available for Sale Securities, Fair Value Disclosure 27,557,000 47,238,000    
Available for Sale Securities, Fair Value Disclosure 11,287,221,000 10,179,365,000    
Fair Value Option Securities [Abstract]        
U.S. Agency Residential Mortgage-backed Securities, Fair Value Option Securities, Fair Value Disclosure 257,040,000 626,109,000    
Corporate Debt Securities, Fair Value Option Securities, Fair Value Disclosure 26,486,000 25,117,000    
Other Debt Securities, Fair Value Option Securities, Fair Value Disclosure 770,000      
Fair Value Option Securities, Fair Value Disclosure 284,296,000 651,226,000    
Residential mortgage loans held for sale 293,762,000 188,125,000    
Loans [Abstract]        
Allowance for loan losses 0 0    
Loans, net of allowance 12,314,243,000 11,256,558,000    
Mortgage servicing rights, Fair Value Disclosure 100,812,000 86,783,000    
Derivative contracts net of cash margin, assets, Fair Value Disclosure 338,106,000 293,859,000    
Other assets - private equity funds, Fair Value Disclosure 28,169,000 30,902,000    
Deposits with no stated maturity 18,211,068,000 15,380,598,000    
Time deposits 3,037,708,000 3,441,610,000    
Other borrowings 2,696,574,000 2,369,224,000    
Subordinated debentures 345,675,000 411,243,000    
Derivative contracts net of cash margin, liabilities, Fair Value DIsclosure 283,589,000 236,522,000    
Commercial 7,606,505,000 6,517,795,000    
Commercial real estate 2,208,217,000 2,267,375,000    
Residential mortgage 2,110,773,000 2,034,898,000    
Consumer 388,748,000 436,490,000    
Total 12,314,243,000 11,256,558,000    
Contractual Yield, Minimum [Member]
        
Loans [Abstract]        
Time deposits 0.0001 0.0001    
Other borrowings 0.0009 0.0025    
Subordinated debentures 0.0100 0.0519    
Commercial 0.0021 0.0025    
Commercial real estate 0.0021 0.0038    
Residential mortgage 0.0038 0.0038    
Consumer 0.0038 0.0038    
Contractual Yield, Maximum [Member]
        
Loans [Abstract]        
Time deposits 0.0964 0.0964    
Other borrowings 0.0525 0.0658    
Subordinated debentures 0.0500 0.0582    
Commercial 0.3000 0.3000    
Commercial real estate 0.1800 0.1800    
Residential mortgage 0.1800 0.1800    
Consumer 0.2100 0.2100    
Average Repricing [Member]
        
Loans [Abstract]        
Time deposits 2.15 2.07    
Other borrowings 0.00 0.00    
Subordinated debentures 3.56 1.44    
Commercial 0.69 0.57    
Commercial real estate 0.92 1.26    
Residential mortgage 3.34 3.26    
Consumer 0.32 0.42    
Discount Rate, Minimum [Member]
        
Loans [Abstract]        
Time deposits 0.0080 0.0102    
Other borrowings 0.0009 0.0004    
Subordinated debentures 0.0240 0.0329    
Commercial 0.0051 0.0063    
Commercial real estate 0.0126 0.0028    
Residential mortgage 0.0086 0.0114    
Consumer 0.0137 0.0188    
Discount Rate, Maximum [Member]
        
Loans [Abstract]        
Time deposits 0.0115 0.0143    
Other borrowings 0.0267 0.0276    
Commercial 0.0359 0.0385    
Commercial real estate 0.0318 0.0351    
Residential mortgage 0.0309 0.0370    
Consumer 0.0360 0.0388    
Fair Value, Measurements, Recurring [Member]
        
Trading Securities [Abstract]        
U.S. Government Agency Obligations, Trading Securities, Fair Value Disclosure 16,545,000 22,203,000    
U.S. Agency Residential Mortgage-backed Securities, Trading Securities, Fair Value Disclosure 86,361,000 12,379,000    
Municipal And Other-tax Exempt Securities, Trading Securities, Fair Value Disclosure 90,326,000 39,345,000    
Other Trading Securities, Trading Securities, Fair Value Disclosure 20,870,000 2,873,000    
Trading Securities, Fair Value Disclosure 214,102,000 76,800,000    
Available for sale securities [Abstract]        
U.S. Treasury, Available for Sale Securities, Fair Value DIsclosure 1,002,000 1,006,000    
Municipal and Other Tax-exempt, Available for Sale Securities, Fair Value Disclosure 87,142,000 68,837,000    
U.S. Agency Residential Mortgage-backed Securities. Available for Sale Securities, Fair Value Disclosure 9,889,821,000 9,588,177,000    
Privately Issued Residential Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 325,163,000 419,166,000    
Commercial Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 895,075,000      
Other Debt Securities, Available for Sale Securities, Fair Value Disclosure 36,389,000 36,495,000    
Perpetual Preferred Stock, Available for Sale Securities, Fair Value Disclosure 25,072,000 18,446,000    
Equity Securities and Mutual Funds, Available for Sale Securities, Fair Value Disclosure 27,557,000 47,238,000    
Available for Sale Securities, Fair Value Disclosure 11,287,221,000 10,179,365,000    
Fair Value Option Securities [Abstract]        
U.S. Agency Residential Mortgage-backed Securities, Fair Value Option Securities, Fair Value Disclosure 257,040,000 626,109,000    
Corporate Debt Securities, Fair Value Option Securities, Fair Value Disclosure 26,486,000 25,117,000    
Other Debt Securities, Fair Value Option Securities, Fair Value Disclosure 770,000      
Fair Value Option Securities, Fair Value Disclosure 284,296,000 651,226,000    
Loans [Abstract]        
Mortgage servicing rights, Fair Value Disclosure 100,812,000 [3] 86,783,000 [3]    
Derivative contracts net of cash margin, assets, Fair Value Disclosure 338,106,000 [4] 293,859,000 [4]    
Other assets - private equity funds, Fair Value Disclosure 28,169,000 30,902,000    
Derivative contracts net of cash margin, liabilities, Fair Value DIsclosure 283,589,000 [4] 236,522,000 [4]    
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
        
Trading Securities [Abstract]        
U.S. Government Agency Obligations, Trading Securities, Fair Value Disclosure 0 0    
U.S. Agency Residential Mortgage-backed Securities, Trading Securities, Fair Value Disclosure 0 0    
Municipal And Other-tax Exempt Securities, Trading Securities, Fair Value Disclosure 0 0    
Other Trading Securities, Trading Securities, Fair Value Disclosure 0 0    
Trading Securities, Fair Value Disclosure 0 0    
Available for sale securities [Abstract]        
U.S. Treasury, Available for Sale Securities, Fair Value DIsclosure 1,002,000 1,006,000    
Municipal and Other Tax-exempt, Available for Sale Securities, Fair Value Disclosure 0 0    
U.S. Agency Residential Mortgage-backed Securities. Available for Sale Securities, Fair Value Disclosure 0 0    
Privately Issued Residential Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 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    
Perpetual Preferred Stock, Available for Sale Securities, Fair Value Disclosure 0 0    
Equity Securities and Mutual Funds, Available for Sale Securities, Fair Value Disclosure 4,165,000 23,596,000    
Available for Sale Securities, Fair Value Disclosure 5,167,000 24,602,000    
Fair Value Option Securities [Abstract]        
U.S. Agency Residential Mortgage-backed Securities, Fair Value Option Securities, Fair Value Disclosure 0 0    
Corporate Debt Securities, Fair Value Option Securities, Fair Value Disclosure 0 0    
Other Debt Securities, Fair Value Option Securities, Fair Value Disclosure 0      
Fair Value Option Securities, Fair Value Disclosure 0 0    
Loans [Abstract]        
Mortgage servicing rights, Fair Value Disclosure 0 [3] 0 [3]    
Derivative contracts net of cash margin, assets, Fair Value Disclosure 11,597,000 [4],[5] 457,000 [4],[6]    
Other assets - private equity funds, Fair Value Disclosure 0 0    
Derivative contracts net of cash margin, liabilities, Fair Value DIsclosure 0 [4] 0 [4]    
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
        
Trading Securities [Abstract]        
U.S. Government Agency Obligations, Trading Securities, Fair Value Disclosure 16,545,000 22,203,000    
U.S. Agency Residential Mortgage-backed Securities, Trading Securities, Fair Value Disclosure 86,361,000 12,379,000    
Municipal And Other-tax Exempt Securities, Trading Securities, Fair Value Disclosure 90,326,000 39,345,000    
Other Trading Securities, Trading Securities, Fair Value Disclosure 20,870,000 2,696,000    
Trading Securities, Fair Value Disclosure 214,102,000 76,623,000    
Available for sale securities [Abstract]        
U.S. Treasury, Available for Sale Securities, Fair Value DIsclosure 0 0    
Municipal and Other Tax-exempt, Available for Sale Securities, Fair Value Disclosure 46,439,000 26,484,000    
U.S. Agency Residential Mortgage-backed Securities. Available for Sale Securities, Fair Value Disclosure 9,889,821,000 9,588,177,000    
Privately Issued Residential Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 325,163,000 419,166,000    
Commercial Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 895,075,000      
Other Debt Securities, Available for Sale Securities, Fair Value Disclosure 30,990,000 30,595,000    
Perpetual Preferred Stock, Available for Sale Securities, Fair Value Disclosure 25,072,000 18,446,000    
Equity Securities and Mutual Funds, Available for Sale Securities, Fair Value Disclosure 21,231,000 23,642,000    
Available for Sale Securities, Fair Value Disclosure 11,233,791,000 10,106,510,000    
Fair Value Option Securities [Abstract]        
U.S. Agency Residential Mortgage-backed Securities, Fair Value Option Securities, Fair Value Disclosure 257,040,000 626,109,000    
Corporate Debt Securities, Fair Value Option Securities, Fair Value Disclosure 26,486,000 25,117,000    
Other Debt Securities, Fair Value Option Securities, Fair Value Disclosure 770,000      
Fair Value Option Securities, Fair Value Disclosure 284,296,000 651,226,000    
Loans [Abstract]        
Mortgage servicing rights, Fair Value Disclosure 0 [3] 0 [3]    
Derivative contracts net of cash margin, assets, Fair Value Disclosure 326,509,000 [4] 293,402,000 [4]    
Other assets - private equity funds, Fair Value Disclosure 0 0    
Derivative contracts net of cash margin, liabilities, Fair Value DIsclosure 283,589,000 [4] 236,522,000 [4]    
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
        
Trading Securities [Abstract]        
U.S. Government Agency Obligations, Trading Securities, Fair Value Disclosure 0 0    
U.S. Agency Residential Mortgage-backed Securities, Trading Securities, Fair Value Disclosure 0 0    
Municipal And Other-tax Exempt Securities, Trading Securities, Fair Value Disclosure 0 0    
Other Trading Securities, Trading Securities, Fair Value Disclosure 0 177,000    
Trading Securities, Fair Value Disclosure 0 177,000    
Available for sale securities [Abstract]        
U.S. Treasury, Available for Sale Securities, Fair Value DIsclosure 0 0    
Municipal and Other Tax-exempt, Available for Sale Securities, Fair Value Disclosure 40,702,000 42,353,000    
U.S. Agency Residential Mortgage-backed Securities. Available for Sale Securities, Fair Value Disclosure 0 0    
Privately Issued Residential Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 0 0    
Commercial Mortgage-backed Securities, Available for Sale Securities, Fair Value Disclosure 0      
Other Debt Securities, Available for Sale Securities, Fair Value Disclosure 5,399,000 5,900,000    
Perpetual Preferred Stock, Available for Sale Securities, Fair Value Disclosure 0 0    
Equity Securities and Mutual Funds, Available for Sale Securities, Fair Value Disclosure 2,161,000 0    
Available for Sale Securities, Fair Value Disclosure 48,262,000 48,253,000    
Fair Value Option Securities [Abstract]        
U.S. Agency Residential Mortgage-backed Securities, Fair Value Option Securities, Fair Value Disclosure 0 0    
Corporate Debt Securities, Fair Value Option Securities, Fair Value Disclosure 0 0    
Other Debt Securities, Fair Value Option Securities, Fair Value Disclosure 0      
Fair Value Option Securities, Fair Value Disclosure 0 0    
Loans [Abstract]        
Mortgage servicing rights, Fair Value Disclosure 100,812,000 [3] 86,783,000 [3]    
Derivative contracts net of cash margin, assets, Fair Value Disclosure 0 [4] 0 [4]    
Other assets - private equity funds, Fair Value Disclosure 28,169,000 30,902,000    
Derivative contracts net of cash margin, liabilities, Fair Value DIsclosure $ 0 [4] $ 0 [4]    
[1] Carrying value includes $5.0 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 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] 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 7, Mortgage Banking Activities.
[4] See Note 3 for detail of fair value of derivative contracts by contract type.
[5] Represents exchange-traded derivative contracts.
[6] Includes interest rate swaps used by borrowers to modify interest rate terms of their loans and to be announced securities used by mortgage banking customers to hedge their loan production.