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Fair Value Measurements, Financial Instruments (Details) (USD $)
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Interest-bearing cash and cash equivalents $ 2,007,901,000   $ 574,282,000 $ 535,313,000    
Trading securities 169,712,000   91,616,000 150,887,000    
Investment securities 655,091,000 [1]   677,878,000 [2] 644,225,000 [3]    
Available for sale securities 9,306,886,000   10,147,162,000 10,372,903,000    
Fair value option securities 175,761,000   167,125,000 167,860,000    
Residential mortgage loans held for sale 373,253,000   200,546,000 230,511,000    
Loans 13,683,739,000   12,792,264,000 12,350,100,000    
Allowance for loan losses (191,244,000) (190,690,000) (185,396,000) (194,325,000) (203,124,000) (215,507,000)
Loans, net of allowance 13,492,495,000   12,606,868,000 12,155,775,000    
Mortgage servicing rights 173,286,000 155,740,000 153,333,000 140,863,000 132,889,000 100,812,000
Derviative Assets, Fair Value, Net of Cash Collateral, assets 360,809,000   265,012,000 377,325,000    
Time deposits 2,664,580,000   2,695,993,000 2,720,020,000    
Subordinated debentures 347,936,000   347,802,000 347,758,000    
Derivative contracts net of cash margin, liabilities 348,687,000   247,185,000 232,544,000    
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]            
Specific allocation of allowance for loan losses included in fair value of loans 163,000,000   157,000,000 153,000,000    
Commercial [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 8,572,038,000   7,943,221,000 7,571,075,000    
Allowance for loan losses (86,775,000) (87,806,000) (79,180,000) (61,780,000) (64,044,000) (65,280,000)
Commercial Real Estate [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 2,724,199,000   2,415,353,000 2,349,229,000    
Allowance for loan losses (42,433,000) (41,252,000) (41,573,000) (45,062,000) (49,687,000) (54,884,000)
Residential Mortgage [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 1,979,663,000   2,052,026,000 2,034,765,000    
Allowance for loan losses (27,216,000) (27,654,000) (29,465,000) (38,297,000) (39,206,000) (41,703,000)
Consumer [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 407,839,000   381,664,000 395,031,000    
Allowance for loan losses (6,876,000) (7,029,000) (6,965,000) (8,304,000) (7,738,000) (9,453,000)
U.S. Government agency debentures [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 41,004,000   34,120,000 74,632,000    
U.S. agency residential mortgage-backed securities [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 33,226,000   21,011,000 26,129,000    
Available for sale securities 6,850,603,000   7,716,010,000 7,981,387,000    
Fair value option securities 175,761,000   157,431,000 163,567,000    
Municipal and other tax-exempt securities [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 76,884,000   27,350,000 37,057,000    
Investment securities 410,595,000 [1]   440,187,000 [2] 409,542,000 [3]    
Available for sale securities 64,363,000   73,775,000 95,440,000    
Other trading securities [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 18,598,000   9,135,000 13,069,000    
U.S. Treasury [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 1,015,000   1,042,000 1,052,000    
Privately issued residential mortgage-backed securities [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 171,493,000   221,099,000 230,900,000    
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 2,141,645,000   2,055,804,000 1,946,295,000    
Other debt securities [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Investment securities 205,911,000 [1]   187,509,000 [2] 178,501,000 [3]    
Available for sale securities 34,291,000   35,241,000 35,362,000    
Fair value option securities 0   9,694,000 4,293,000    
Perpetual preferred stock [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 24,358,000   22,863,000 23,680,000    
Equity securities and mutual funds [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Available for sale securities 19,118,000   21,328,000 58,787,000    
Carrying (Reported) Amount, Fair Value Disclosure [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 557,658,000   512,931,000 625,671,000    
Interest-bearing cash and cash equivalents 2,007,901,000   574,282,000 535,313,000    
Trading securities 169,712,000   91,616,000 150,887,000    
Investment securities 655,091,000   677,878,000 644,225,000    
Available for sale securities 9,306,886,000   10,147,162,000 10,372,903,000    
Fair value option securities 175,761,000   167,125,000 167,860,000    
Residential mortgage loans held for sale 373,253,000   200,546,000 230,511,000    
Loans 13,683,739,000   12,792,264,000 12,350,100,000    
Allowance for loan losses (191,244,000)   (185,396,000) (194,325,000)    
Loans, net of allowance 13,492,495,000   12,606,868,000 12,155,775,000    
Mortgage servicing rights 173,286,000   153,333,000 140,863,000    
Derviative Assets, Fair Value, Net of Cash Collateral, assets 360,809,000   265,012,000 377,325,000    
Other assets - private equity funds 27,118,000   27,341,000 27,799,000    
Deposits with no stated maturity 17,624,476,000   17,573,334,000 16,771,635,000    
Time deposits 2,664,580,000   2,695,993,000 2,720,020,000    
Other borrowed funds 4,595,631,000   2,721,888,000 3,611,944,000    
Subordinated debentures 347,936,000   347,802,000 347,758,000    
Derivative contracts net of cash margin, liabilities 348,687,000   247,185,000 232,544,000    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 8,572,038,000   7,943,221,000 7,571,075,000    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial Real Estate [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 2,724,199,000   2,415,353,000 2,349,229,000    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Residential Mortgage [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 1,979,663,000   2,052,026,000 2,034,765,000    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Consumer [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 407,839,000   381,664,000 395,031,000    
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 41,004,000   34,120,000 74,632,000    
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 33,226,000   21,011,000 26,129,000    
Investment securities 38,585,000   50,182,000 56,182,000    
Available for sale securities 6,850,603,000   7,716,010,000 7,981,387,000    
Fair value option securities 175,761,000   157,431,000 163,567,000    
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 76,884,000   27,350,000 37,057,000    
Investment securities 410,595,000   440,187,000 409,542,000    
Available for sale securities 64,363,000   73,775,000 95,440,000    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other trading securities [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 18,598,000   9,135,000 13,069,000    
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 1,015,000   1,042,000 1,052,000    
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 171,493,000   221,099,000 230,900,000    
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 2,141,645,000   2,055,804,000 1,946,295,000    
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other debt securities [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Investment securities 205,911,000   187,509,000 178,501,000    
Available for sale securities 34,291,000   35,241,000 35,362,000    
Fair value option securities 0   9,694,000 4,293,000    
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 24,358,000   22,863,000 23,680,000    
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 19,118,000   21,328,000 58,787,000    
Estimate of Fair Value, Fair Value Disclosure [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and due from banks 557,658,000   512,931,000 625,671,000    
Interest-bearing cash and cash equivalents 2,007,901,000   574,282,000 535,313,000    
Trading securities 169,712,000   91,616,000 150,887,000    
Investment securities 676,445,000   687,127,000 654,479,000    
Available for sale securities 9,306,886,000   10,147,162,000 10,372,903,000    
Fair value option securities 175,761,000   167,125,000 167,860,000    
Residential mortgage loans held for sale 373,253,000   200,546,000 230,511,000    
Loans 13,555,114,000   12,674,420,000 12,264,613,000    
Allowance for loan losses 0   0 0    
Loans, net of allowance 13,555,114,000   12,674,420,000 12,264,613,000    
Mortgage servicing rights 173,286,000   153,333,000 140,863,000    
Derviative Assets, Fair Value, Net of Cash Collateral, assets 360,809,000   265,012,000 377,325,000    
Other assets - private equity funds 27,118,000   27,341,000 27,799,000    
Deposits with no stated maturity 17,624,476,000   17,573,334,000 16,771,635,000    
Time deposits 2,670,657,000   2,697,290,000 2,739,764,000    
Other borrowed funds 4,555,307,000   2,693,788,000 3,570,228,000    
Subordinated debentures 344,764,000   344,783,000 344,854,000    
Derivative contracts net of cash margin, liabilities 348,687,000   247,185,000 232,544,000    
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 8,441,120,000   7,835,325,000 7,493,143,000    
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial Real Estate [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 2,702,389,000   2,394,443,000 2,326,908,000    
Estimate of Fair Value, Fair Value Disclosure [Member] | Residential Mortgage [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 2,009,619,000   2,068,690,000 2,056,072,000    
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 401,986,000   375,962,000 388,490,000    
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 41,004,000   34,120,000 74,632,000    
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 33,226,000   21,011,000 26,129,000    
Investment securities 40,259,000   51,864,000 58,442,000    
Available for sale securities 6,850,603,000   7,716,010,000 7,981,387,000    
Fair value option securities 175,761,000   157,431,000 163,567,000    
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 76,884,000   27,350,000 37,057,000    
Investment securities 415,233,000   439,870,000 407,562,000    
Available for sale securities 64,363,000   73,775,000 95,440,000    
Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Trading securities 18,598,000   9,135,000 13,069,000    
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 1,015,000   1,042,000 1,052,000    
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 171,493,000   221,099,000 230,900,000    
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 2,141,645,000   2,055,804,000 1,946,295,000    
Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Investment securities 220,953,000   195,393,000 188,475,000    
Available for sale securities 34,291,000   35,241,000 35,362,000    
Fair value option securities 0   9,694,000 4,293,000    
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 24,358,000   22,863,000 23,680,000    
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 19,118,000   21,328,000 58,787,000    
Contractual Yield, Minimum [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Time deposits 0.0002   0.0001 0.0001    
Other borrowed funds 0.0021   0.0025 0.0025    
Subordinated debentures 0.0092   0.0095 0.0097    
Contractual Yield, Minimum [Member] | Commercial [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0.0025   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 0.0120   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 borrowed funds 0.0668   0.0478 0.0478    
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 2.02   2.12 2.08    
Other borrowed funds 0.46   0.03 0.00    
Subordinated debentures 2.00   2.63 2.87    
Average Repricing [Member] | Commercial [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0.60   0.49 0.46    
Average Repricing [Member] | Commercial Real Estate [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0.80   0.78 0.79    
Average Repricing [Member] | Residential Mortgage [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 2.42   2.63 2.56    
Average Repricing [Member] | Consumer [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0.46   0.55 0.55    
Discount Rate, Minimum [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Time deposits 0.0074   0.0075 0.0075    
Other borrowed funds 0.0007   0.0008 0.0006    
Subordinated debentures 0.0217   0.0222 0.0222    
Discount Rate, Minimum [Member] | Commercial [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0.0053   0.0048 0.0050    
Discount Rate, Minimum [Member] | Commercial Real Estate [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0.0113   0.0121 0.0120    
Discount Rate, Minimum [Member] | Residential Mortgage [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0.0057   0.0059 0.0064    
Discount Rate, Minimum [Member] | Consumer [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0.0107   0.0122 0.0124    
Discount Rate, Maximum [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Time deposits 0.0131   0.0133 0.0128    
Other borrowed funds 0.0262   0.0264 0.0265    
Subordinated debentures 0.0217   0.0222 0.0222    
Discount Rate, Maximum [Member] | Commercial [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0.0430   0.0433 0.0419    
Discount Rate, Maximum [Member] | Commercial Real Estate [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0.0366   0.0349 0.0342    
Discount Rate, Maximum [Member] | Residential Mortgage [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans 0.0421   0.0473 0.0440    
Discount Rate, Maximum [Member] | Consumer [Member]
            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Loans $ 0.0388   $ 0.0375 $ 0.0371    
[1] Carrying value includes $822 thousand 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 $2.3 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.