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Fair Value Measurements, Financial Instruments (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Interest-bearing cash and cash equivalents $ 708,571,000 $ 574,282,000 $ 487,146,000  
Trading securities 86,571,000 91,616,000 206,598,000  
Investment securities 668,976,000 [1] 677,878,000 [2] 589,271,000 [3]  
Available for sale securities 9,933,723,000 10,147,162,000 11,059,145,000  
Fair value option securities 160,884,000 167,125,000 210,192,000  
Residential mortgage loans held for sale 226,512,000 200,546,000 286,211,000  
Loans 13,077,854,000 12,792,264,000 12,093,564,000  
Allowance for loan losses (188,318,000) (185,396,000) (205,965,000) (215,507,000)
Loans, net of allowance 12,889,536,000 12,606,868,000 11,887,599,000  
Mortgage servicing rights 153,774,000 153,333,000 109,840,000 100,812,000
Derviative contracts, net of cash margin, assets 218,507,000 265,012,000 320,473,000  
Time deposits 2,662,174,000 2,695,993,000 2,900,054,000  
Subordinated debentures 347,846,000 347,802,000 347,674,000  
Derivative contracts net of cash margin, liabilities 185,499,000 247,185,000 251,836,000  
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]        
Specific allocation of allowance for loan losses included in fair value of loans 161,000,000 157,000,000 163,000,000  
Commercial [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 8,051,706,000 7,943,221,000 7,418,305,000  
Allowance for loan losses (85,246,000) (79,180,000) (66,419,000) (65,280,000)
Commercial Real Estate [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 2,631,407,000 2,415,353,000 2,285,160,000  
Allowance for loan losses (41,589,000) (41,573,000) (48,528,000) (54,884,000)
Residential Mortgage [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 2,018,675,000 2,052,026,000 2,012,450,000  
Allowance for loan losses (28,307,000) (29,465,000) (40,222,000) (41,703,000)
Consumer [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 376,066,000 381,664,000 377,649,000  
Allowance for loan losses (6,211,000) (6,965,000) (7,984,000) (9,453,000)
U.S. Government agency debentures [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 28,588,000 34,120,000 55,358,000  
U.S. agency residential mortgage-backed securities [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 23,595,000 21,011,000 33,106,000  
Available for sale securities 7,475,569,000 7,716,010,000 9,165,212,000  
Fair value option securities 156,525,000 157,431,000 208,900,000  
Municipal and other tax-exempt securities [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 27,280,000 27,350,000 90,710,000  
Investment securities 440,303,000 [1] 440,187,000 [2] 339,003,000 [3]  
Available for sale securities 70,065,000 73,775,000 85,447,000  
Other trading securities [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 7,108,000 9,135,000 27,424,000  
U.S. Treasury [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 1,034,000 1,042,000 1,000,000  
Privately issued residential mortgage-backed securities [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 189,248,000 221,099,000 316,208,000  
Commercial mortgage-backed securities guaranteed by U.S. government agencies [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 2,123,762,000 2,055,804,000 1,405,346,000  
Other debt securities [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment securities 182,756,000 [1] 187,509,000 [2] 177,300,000 [3]  
Available for sale securities 35,119,000 35,241,000 36,079,000  
Fair value option securities 4,359,000 9,694,000 1,292,000  
Perpetual preferred stock [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 24,281,000 22,863,000 26,832,000  
Equity securities and mutual funds [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 14,645,000 21,328,000 23,021,000  
Carrying (Reported) Amount, Fair Value Disclosure [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks 645,435,000 512,931,000 458,471,000  
Interest-bearing cash and cash equivalents 708,571,000 574,282,000 487,146,000  
Trading securities 86,571,000 91,616,000 206,598,000  
Investment securities 668,976,000 677,878,000 589,271,000  
Available for sale securities 9,933,723,000 10,147,162,000 11,059,145,000  
Fair value option securities 160,884,000 167,125,000 210,192,000  
Residential mortgage loans held for sale 226,512,000 200,546,000 286,211,000  
Loans 13,077,854,000 12,792,264,000 12,093,564,000  
Allowance for loan losses (188,318,000) (185,396,000) (205,965,000)  
Loans, net of allowance 12,889,536,000 12,606,868,000 11,887,599,000  
Mortgage servicing rights 153,774,000 153,333,000 109,840,000  
Derviative contracts, net of cash margin, assets 218,507,000 265,012,000 320,473,000  
Other assets - private equity funds 27,466,000 27,341,000 29,216,000  
Deposits with no stated maturity 17,727,539,000 17,573,334,000 16,960,237,000  
Time deposits 2,662,174,000 2,695,993,000 2,900,054,000  
Other borrowings 2,974,979,000 2,721,888,000 3,393,416,000  
Subordinated debentures 347,846,000 347,802,000 347,674,000  
Derivative contracts net of cash margin, liabilities 185,499,000 247,185,000 251,836,000  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 8,051,706,000 7,943,221,000 7,418,305,000  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial Real Estate [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 2,631,407,000 2,415,353,000 2,285,160,000  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Residential Mortgage [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 2,018,675,000 2,052,026,000 2,012,450,000  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Consumer [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 376,066,000 381,664,000 377,649,000  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. Government agency debentures [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 28,588,000 34,120,000 55,358,000  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. agency residential mortgage-backed securities [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 23,595,000 21,011,000 33,106,000  
Investment securities 45,917,000 50,182,000 72,968,000  
Available for sale securities 7,475,569,000 7,716,010,000 9,165,212,000  
Fair value option securities 156,525,000 157,431,000 208,900,000  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Municipal and other tax-exempt securities [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 27,280,000 27,350,000 90,710,000  
Investment securities 440,303,000 440,187,000 339,003,000  
Available for sale securities 70,065,000 73,775,000 85,447,000  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other trading securities [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 7,108,000 9,135,000 27,424,000  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. Treasury [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 1,034,000 1,042,000 1,000,000  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Privately issued residential mortgage-backed securities [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 189,248,000 221,099,000 316,208,000  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 2,123,762,000 2,055,804,000 1,405,346,000  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other debt securities [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment securities 182,756,000 187,509,000 177,300,000  
Available for sale securities 35,119,000 35,241,000 36,079,000  
Fair value option securities 4,359,000 9,694,000 1,292,000  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Perpetual preferred stock [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 24,281,000 22,863,000 26,832,000  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Equity securities and mutual funds [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 14,645,000 21,328,000 23,021,000  
Estimate of Fair Value, Fair Value Disclosure [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks 645,435,000 512,931,000 458,471,000  
Interest-bearing cash and cash equivalents 708,571,000 574,282,000 487,146,000  
Trading securities 86,571,000 91,616,000 206,598,000  
Investment securities 685,063,000 687,127,000 615,194,000  
Available for sale securities 9,933,723,000 10,147,162,000 11,059,145,000  
Fair value option securities 160,884,000 167,125,000 210,192,000  
Residential mortgage loans held for sale 226,512,000 200,546,000 286,211,000  
Loans 12,962,481,000 12,674,420,000 12,073,380,000  
Allowance for loan losses 0 0 0  
Loans, net of allowance 12,962,481,000 12,674,420,000 12,073,380,000  
Mortgage servicing rights 153,774,000 153,333,000 109,840,000  
Derviative contracts, net of cash margin, assets 218,507,000 265,012,000 320,473,000  
Other assets - private equity funds 27,466,000 27,341,000 29,216,000  
Deposits with no stated maturity 17,727,539,000 17,573,334,000 16,960,237,000  
Time deposits 2,664,770,000 2,697,290,000 2,958,570,000  
Other borrowings 2,960,177,000 2,693,788,000 3,398,902,000  
Subordinated debentures 344,717,000 344,783,000 345,527,000  
Derivative contracts net of cash margin, liabilities 185,499,000 247,185,000 251,836,000  
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 7,941,638,000 7,835,325,000 7,372,375,000  
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial Real Estate [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 2,609,622,000 2,394,443,000 2,266,433,000  
Estimate of Fair Value, Fair Value Disclosure [Member] | Residential Mortgage [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 2,040,336,000 2,068,690,000 2,062,801,000  
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 370,885,000 375,962,000 371,771,000  
Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Government agency debentures [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 28,588,000 34,120,000 55,358,000  
Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. agency residential mortgage-backed securities [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 23,595,000 21,011,000 33,106,000  
Investment securities 47,834,000 51,864,000 76,851,000  
Available for sale securities 7,475,569,000 7,716,010,000 9,165,212,000  
Fair value option securities 156,525,000 157,431,000 208,900,000  
Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal and other tax-exempt securities [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 27,280,000 27,350,000 90,710,000  
Investment securities 441,532,000 439,870,000 341,940,000  
Available for sale securities 70,065,000 73,775,000 85,447,000  
Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 7,108,000 9,135,000 27,424,000  
Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 1,034,000 1,042,000 1,000,000  
Estimate of Fair Value, Fair Value Disclosure [Member] | Privately issued residential mortgage-backed securities [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 189,248,000 221,099,000 316,208,000  
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 2,123,762,000 2,055,804,000 1,405,346,000  
Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment securities 195,697,000 195,393,000 196,403,000  
Available for sale securities 35,119,000 35,241,000 36,079,000  
Fair value option securities 4,359,000 9,694,000 1,292,000  
Estimate of Fair Value, Fair Value Disclosure [Member] | Perpetual preferred stock [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 24,281,000 22,863,000 26,832,000  
Estimate of Fair Value, Fair Value Disclosure [Member] | Equity securities and mutual funds [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 14,645,000 21,328,000 23,021,000  
Contractual Yield, Minimum [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Time deposits 0.0003 0.0001 0.0003  
Other borrowings 0.0023 0.0025 0.0013  
Subordinated debentures 0.0095 0.0095 0.0098  
Contractual Yield, Minimum [Member] | Commercial [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0.0015 0.0004 0.0025  
Contractual Yield, Minimum [Member] | Commercial Real Estate [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0.0038 0.0038 0.0038  
Contractual Yield, Minimum [Member] | Residential Mortgage [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0.0001 0.0038 0.0038  
Contractual Yield, Minimum [Member] | Consumer [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0.0038 0.0038 0.0038  
Contractual Yield, Maximum [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Time deposits 0.0964 0.0964 0.0964  
Other borrowings 0.0450 0.0478 0.0525  
Subordinated debentures 0.0500 0.0500 0.0500  
Contractual Yield, Maximum [Member] | Commercial [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0.3000 0.3000 0.3000  
Contractual Yield, Maximum [Member] | Commercial Real Estate [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0.1800 0.1800 0.1800  
Contractual Yield, Maximum [Member] | Residential Mortgage [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0.1800 0.1800 0.1800  
Contractual Yield, Maximum [Member] | Consumer [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0.2100 0.2100 0.2100  
Average Repricing [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Time deposits 2.08 2.12 2.14  
Other borrowings 0.11 0.03 0.00  
Subordinated debentures 2.40 2.63 3.33  
Average Repricing [Member] | Commercial [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0.52 0.49 0.66  
Average Repricing [Member] | Commercial Real Estate [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0.74 0.78 0.84  
Average Repricing [Member] | Residential Mortgage [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 2.60 2.63 3.53  
Average Repricing [Member] | Consumer [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0.50 0.55 0.31  
Discount Rate, Minimum [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Time deposits 0.0074 0.0075 0.0078  
Other borrowings 0.0006 0.0008 0.0013  
Subordinated debentures 0.0221 0.0222 0.0222  
Discount Rate, Minimum [Member] | Commercial [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0.0055 0.0048 0.0055  
Discount Rate, Minimum [Member] | Commercial Real Estate [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0.0115 0.0121 0.0119  
Discount Rate, Minimum [Member] | Residential Mortgage [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0.0057 0.0059 0.0074  
Discount Rate, Minimum [Member] | Consumer [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0.0114 0.0122 0.0128  
Discount Rate, Maximum [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Time deposits 0.0132 0.0133 0.0115  
Other borrowings 0.0262 0.0264 0.0267  
Subordinated debentures 0.0221 0.0222 0.0222  
Discount Rate, Maximum [Member] | Commercial [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0.0428 0.0433 0.0369  
Discount Rate, Maximum [Member] | Commercial Real Estate [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0.0354 0.0349 0.0321  
Discount Rate, Maximum [Member] | Residential Mortgage [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0.0454 0.0473 0.0329  
Discount Rate, Maximum [Member] | Consumer [Member]
        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans $ 0.0380 $ 0.0375 $ 0.0353  
[1] Carrying value includes $1.4 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.
[2] Carrying value includes $1.8 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 $3.9 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.