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Fair Value Measurements, Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Interest-bearing cash and cash equivalents $ 2,220,640 $ 1,916,651 $ 1,831,162  
Trading securities 677,156 337,628 279,539  
Investment securities 519,402 546,145 576,047  
Available for sale securities 8,437,291 8,676,829 8,886,036  
Fair value option securities 441,714 77,046 418,887  
Residential mortgage loans held for sale 248,707 301,897 332,040  
Loans 16,991,906 16,989,660 16,022,566  
Allowance for loan losses (248,710) (246,159) (233,156) $ (225,524)
Loans, net of allowance 16,743,196 16,743,501 15,789,410  
Mortgage servicing rights 249,403 247,073 196,055 218,605
Derviative contracts, net of cash collateral, Assets, Fair value 304,727 689,872 790,146  
Time deposits 2,243,848 2,221,800 2,341,374  
Subordinated debentures 144,649 144,640 226,385  
Derivative contracts, net of cash margin, Liabilities, Fair Value 276,422 664,531 705,578  
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]        
Specific allocation of allowance for loan losses included in fair value of loans 221,000 218,000 208,000  
Commercial        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 10,327,110 10,390,824 10,288,425  
Allowance for loan losses (137,616) (140,213) (139,793) (130,334)
Commercial real estate        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 3,871,063 3,809,046 3,370,507  
Allowance for loan losses (58,343) (50,749) (44,453) (41,391)
Residential mortgage        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 1,946,274 1,949,832 1,869,309  
Allowance for loan losses (18,177) (18,224) (18,467) (19,509)
Personal        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 847,459 839,958 494,325  
Allowance for loan losses (7,247) (8,773) (5,022) $ (4,164)
U.S. government agency debentures        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 18,365 6,234 59,733  
U.S. government agency residential mortgage-backed securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 578,977 310,067 146,896  
Available for sale securities 5,372,916 5,460,386 5,716,525  
Fair value option securities 441,714 77,046 418,887  
Municipal and other tax-exempt securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 45,114 14,427 58,797  
Investment securities 298,811 320,364 347,684  
Available for sale securities 35,453 40,993 51,308  
Other trading securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 34,700 6,900 14,113  
U.S. Treasury        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 999 999 1,003  
Privately issued residential mortgage-backed securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 108,626 115,535 133,030  
Commercial mortgage-backed securities guaranteed by U.S. government agencies        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 2,877,028 3,017,933 2,942,404  
Other debt securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment securities 201,213 205,004 202,997  
Available for sale securities 4,153 4,152 4,151  
Perpetual preferred stock        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 19,272 18,474 19,575  
Equity securities and mutual funds        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 18,844 18,357 18,040  
Carrying (Reported) Amount, Fair Value Disclosure [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks 546,575 620,846 481,510  
Interest-bearing cash and cash equivalents 2,220,640 1,916,651 1,831,162  
Trading securities 677,156 337,628 279,539  
Investment securities 519,402 546,145 576,047  
Available for sale securities 8,437,291 8,676,829 8,886,036  
Residential mortgage loans held for sale 248,707 301,897 332,040  
Loans 16,991,906 16,989,660 16,022,566  
Allowance for loan losses (248,710) (246,159) (233,156)  
Loans, net of allowance 16,743,196 16,743,501 15,789,410  
Mortgage servicing rights 249,403 247,073 196,055  
Derviative contracts, net of cash collateral, Assets, Fair value 304,727 689,872 790,146  
Deposits with no stated maturity 20,331,511 20,526,295 18,076,946  
Time deposits 2,243,848 2,221,800 2,341,374  
Other borrowed funds 5,794,928 5,572,662 6,326,718  
Subordinated debentures 144,649 144,640 226,385  
Derivative contracts, net of cash margin, Liabilities, Fair Value 276,422 664,531 705,578  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 10,327,110 10,390,824 10,288,425  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial real estate        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 3,871,063 3,809,046 3,370,507  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Residential mortgage        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 1,946,274 1,949,832 1,869,309  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Personal        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 847,459 839,958 494,325  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. government agency debentures        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 18,365 6,234 59,733  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. government agency residential mortgage-backed securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 578,977 310,067 146,896  
Investment securities 19,378 20,777 25,366  
Available for sale securities 5,372,916 5,460,386 5,716,525  
Fair value option securities 441,714 77,046 418,887  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Municipal and other tax-exempt securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 45,114 14,427 58,797  
Investment securities 298,811 320,364 347,684  
Available for sale securities 35,453 40,993 51,308  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other trading securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 34,700 6,900 14,113  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | U.S. Treasury        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 999 999 1,003  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Privately issued residential mortgage-backed securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 108,626 115,535 133,030  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 2,877,028 3,017,933 2,942,404  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Other debt securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment securities 201,213 205,004 202,997  
Available for sale securities 4,153 4,152 4,151  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Perpetual preferred stock        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 19,272 18,474 19,575  
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Equity securities and mutual funds        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 18,844 18,357 18,040  
Estimate of Fair Value, Fair Value Disclosure [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks 546,575 620,846 481,510  
Interest-bearing cash and cash equivalents 2,220,640 1,916,651 1,831,162  
Trading securities 677,156 337,628 279,539  
Investment securities 540,663 565,493 609,743  
Available for sale securities 8,437,291 8,676,829 8,886,036  
Residential mortgage loans held for sale 248,707 301,897 332,040  
Loans 16,702,382 17,178,060 15,839,847  
Allowance for loan losses 0 0 0  
Loans, net of allowance 16,702,382 17,178,060 15,839,847  
Mortgage servicing rights 249,403 247,073 196,055  
Derviative contracts, net of cash collateral, Assets, Fair value 304,727 689,872 790,146  
Deposits with no stated maturity 20,331,511 20,526,295 18,076,946  
Time deposits 2,207,968 2,218,303 2,339,734  
Other borrowed funds 5,790,533 5,556,327 6,309,208  
Subordinated debentures 140,888 128,903 224,314  
Derivative contracts, net of cash margin, Liabilities, Fair Value 276,422 664,531 705,578  
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 10,088,885 10,437,016 10,092,121  
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 3,816,898 3,850,981 3,351,250  
Estimate of Fair Value, Fair Value Disclosure [Member] | Residential mortgage        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 1,957,635 2,025,159 1,906,310  
Estimate of Fair Value, Fair Value Disclosure [Member] | Personal        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 838,964 864,904 490,166  
Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency debentures        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 18,365 6,234 59,733  
Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency residential mortgage-backed securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 578,977 310,067 146,896  
Investment securities 19,967 21,473 26,794  
Available for sale securities 5,372,916 5,460,386 5,716,525  
Fair value option securities 441,714 77,046 418,887  
Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal and other tax-exempt securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 45,114 14,427 58,797  
Investment securities 301,128 321,225 352,542  
Available for sale securities 35,453 40,993 51,308  
Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 34,700 6,900 14,113  
Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 999 999 1,003  
Estimate of Fair Value, Fair Value Disclosure [Member] | Privately issued residential mortgage-backed securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 108,626 115,535 133,030  
Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 2,877,028 3,017,933 2,942,404  
Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment securities 219,568 222,795 230,407  
Available for sale securities 4,153 4,152 4,151  
Estimate of Fair Value, Fair Value Disclosure [Member] | Perpetual preferred stock        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 19,272 18,474 19,575  
Estimate of Fair Value, Fair Value Disclosure [Member] | Equity securities and mutual funds        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 18,844 18,357 18,040  
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks 546,575 620,846 481,510  
Interest-bearing cash and cash equivalents 2,220,640 1,916,651 1,831,162  
Trading securities 0 0 0  
Investment securities 0 0 0  
Available for sale securities 4,905 4,494 4,219  
Residential mortgage loans held for sale 0 0 0  
Loans 0 0 0  
Allowance for loan losses 0 0 0  
Loans, net of allowance 0 0 0  
Mortgage servicing rights 0 0 0  
Derviative contracts, net of cash collateral, Assets, Fair value 23,128 7,541 29,533  
Deposits with no stated maturity 0 0 0  
Time deposits 0 0 0  
Other borrowed funds 0 0 0  
Subordinated debentures 0 0 0  
Derivative contracts, net of cash margin, Liabilities, Fair Value 11,628 6,972 3,084  
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0 0 0  
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0 0 0  
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential mortgage        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0 0 0  
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Personal        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0 0 0  
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency debentures        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 0 0 0  
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency residential mortgage-backed securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 0 0 0  
Investment securities 0 0 0  
Available for sale securities 0 0 0  
Fair value option securities 0 0 0  
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal and other tax-exempt securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 0 0 0  
Investment securities 0 0 0  
Available for sale securities 0 0 0  
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 0 0 0  
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 999 999 1,003  
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Privately issued residential mortgage-backed securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 0 0 0  
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 0 0 0  
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment securities 0 0 0  
Available for sale securities 0 0 0  
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Perpetual preferred stock        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 0 0 0  
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity securities and mutual funds        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 3,906 3,495 3,216  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks 0 0 0  
Interest-bearing cash and cash equivalents 0 0 0  
Trading securities 677,156 337,628 279,539  
Investment securities 540,663 565,493 609,743  
Available for sale securities 8,422,511 8,662,394 8,868,052  
Residential mortgage loans held for sale 236,028 290,280 323,941  
Loans 0 0 0  
Allowance for loan losses 0 0 0  
Loans, net of allowance 0 0 0  
Mortgage servicing rights 0 0 0  
Derviative contracts, net of cash collateral, Assets, Fair value 281,599 682,331 760,613  
Deposits with no stated maturity 0 0 0  
Time deposits 0 0 0  
Other borrowed funds 0 0 0  
Subordinated debentures 140,888 128,903 0  
Derivative contracts, net of cash margin, Liabilities, Fair Value 264,794 657,559 702,494  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0 0 0  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0 0 0  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential mortgage        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0 0 0  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Personal        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 0 0 0  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency debentures        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 18,365 6,234 59,733  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency residential mortgage-backed securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 578,977 310,067 146,896  
Investment securities 19,967 21,473 26,794  
Available for sale securities 5,372,916 5,460,386 5,716,525  
Fair value option securities 441,714 77,046 418,887  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal and other tax-exempt securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 45,114 14,427 58,797  
Investment securities 301,128 321,225 352,542  
Available for sale securities 29,731 35,204 41,694  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 34,700 6,900 14,113  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 0 0 0  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Privately issued residential mortgage-backed securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 108,626 115,535 133,030  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 2,877,028 3,017,933 2,942,404  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment securities 219,568 222,795 230,407  
Available for sale securities 0 0 0  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Perpetual preferred stock        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 19,272 18,474 19,575  
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity securities and mutual funds        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 14,938 14,862 14,824  
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and due from banks 0 0 0  
Interest-bearing cash and cash equivalents 0 0 0  
Trading securities 0 0 0  
Investment securities 0 0 0  
Available for sale securities 9,875 9,941 13,765  
Residential mortgage loans held for sale 12,679 11,617 8,099  
Loans 16,702,382 17,178,060 15,839,847  
Allowance for loan losses 0 0 0  
Loans, net of allowance 16,702,382 17,178,060 15,839,847  
Mortgage servicing rights 249,403 247,073 196,055  
Derviative contracts, net of cash collateral, Assets, Fair value 0 0 0  
Deposits with no stated maturity 20,331,511 20,526,295 18,076,946  
Time deposits 2,207,968 2,218,303 2,339,734  
Other borrowed funds 5,790,533 5,556,327 6,309,208  
Subordinated debentures 0 0 224,314  
Derivative contracts, net of cash margin, Liabilities, Fair Value 0 0 0  
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 10,088,885 10,437,016 10,092,121  
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial real estate        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 3,816,898 3,850,981 3,351,250  
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Residential mortgage        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 1,957,635 2,025,159 1,906,310  
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Personal        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans 838,964 864,904 490,166  
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency debentures        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 0 0 0  
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. government agency residential mortgage-backed securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 0 0 0  
Investment securities 0 0 0  
Available for sale securities 0 0 0  
Fair value option securities 0 0 0  
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal and other tax-exempt securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 0 0 0  
Investment securities 0 0 0  
Available for sale securities 5,722 5,789 9,614  
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other trading securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Trading securities 0 0 0  
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | U.S. Treasury        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 0 0 0  
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Privately issued residential mortgage-backed securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 0 0 0  
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Commercial mortgage-backed securities guaranteed by U.S. government agencies        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 0 0 0  
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Other debt securities        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Investment securities 0 0 0  
Available for sale securities 4,153 4,152 4,151  
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Perpetual preferred stock        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities 0 0 0  
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] | Equity securities and mutual funds        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Available for sale securities $ 0 $ 0 $ 0