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Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment $ 15,512,451 $ 15,297,889 $ 15,134,711  
Non-Graded, Recorded Investment 1,825,399 1,855,535 1,857,195  
Total 17,337,850 17,153,424 16,991,906  
Related Allowance [Abstract]        
Internally Risk Graded, Allowance 185,791 189,412 203,109  
Non-Graded, Allowance 18,201 19,053 18,274  
Total 223,967 230,682 248,710 $ 246,159
Commercial        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 10,894,979 10,706,035 10,302,774  
Non-Graded, Recorded Investment 24,688 27,940 24,336  
Total 10,919,667 10,733,975 10,327,110  
Related Allowance [Abstract]        
Internally Risk Graded, Allowance 119,202 123,383 136,672  
Non-Graded, Allowance 881 886 944  
Total 120,083 124,269 137,616 140,213
Commercial | Energy [Member]        
Recorded Investment [Abstract]        
Total 2,969,618 2,930,156 2,537,112  
Commercial | Services [Member]        
Recorded Investment [Abstract]        
Total 2,928,294 2,986,949 3,013,375  
Commercial | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Total 1,531,576 1,471,256 1,506,243  
Commercial | Manufacturing [Member]        
Recorded Investment [Abstract]        
Total 559,695 496,774 543,430  
Commercial | Healthcare [Member]        
Recorded Investment [Abstract]        
Total 2,359,928 2,314,753 2,265,604  
Commercial | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Total 570,556 534,087 461,346  
Commercial real estate        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,506,782 3,479,987 3,871,063  
Non-Graded, Recorded Investment 0 0 0  
Total 3,506,782 3,479,987 3,871,063  
Related Allowance [Abstract]        
Internally Risk Graded, Allowance 57,070 56,621 58,343  
Non-Graded, Allowance 0 0 0  
Total 57,070 56,621 58,343 50,749
Commercial real estate | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Total 117,458 117,245 135,994  
Commercial real estate | Retail [Member]        
Recorded Investment [Abstract]        
Total 750,396 691,532 745,046  
Commercial real estate | Office [Member]        
Recorded Investment [Abstract]        
Total 737,144 831,770 860,889  
Commercial real estate | Multifamily [Member]        
Recorded Investment [Abstract]        
Total 1,008,903 980,017 922,991  
Commercial real estate | Industrial [Member]        
Recorded Investment [Abstract]        
Total 613,608 573,014 871,463  
Commercial real estate | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Total 279,273 286,409 334,680  
Residential mortgage        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 229,996 234,477 211,846  
Non-Graded, Recorded Investment 1,715,773 1,739,209 1,734,428  
Total 1,945,769 1,973,686 1,946,274  
Related Allowance [Abstract]        
Internally Risk Graded, Allowance 2,949 2,947 2,958  
Non-Graded, Allowance 15,482 15,504 15,219  
Total 18,431 18,451 18,177 18,224
Residential mortgage | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Total 1,047,785 1,043,435 977,743  
Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member]        
Recorded Investment [Abstract]        
Total 177,880 197,506 204,181  
Residential mortgage | Home equity [Member]        
Recorded Investment [Abstract]        
Total 720,104 732,745 764,350  
Personal        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 880,694 877,390 749,028  
Non-Graded, Recorded Investment 84,938 88,386 98,431  
Total 965,632 965,776 847,459  
Related Allowance [Abstract]        
Internally Risk Graded, Allowance 6,570 6,461 5,136  
Non-Graded, Allowance 1,838 2,663 2,111  
Total 8,408 9,124 7,247 8,773
Specific Allowance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 15,512,451 15,297,889 15,134,711  
Non-Graded, Recorded Investment 1,825,399 1,855,535 1,857,195  
Total 17,337,850 17,153,424 16,991,906  
Related Allowance [Abstract]        
Internally Risk Graded, Allowance 185,791 189,412 203,109  
Non-Graded, Allowance 18,201 19,053 18,274  
Total 203,992 208,465 221,383  
Nonspecific Allowance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Non-Graded, Recorded Investment 0 0 0  
Total 0 0 0  
Related Allowance [Abstract]        
Internally Risk Graded, Allowance 0 0 0  
Non-Graded, Allowance 0 0 0  
Total 19,975 22,217 27,327 $ 28,200
Performing [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 1,780,441 1,808,995 1,812,686  
Performing [Member] | Commercial        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 24,664 27,870 24,292  
Performing [Member] | Commercial | Energy [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0 0  
Performing [Member] | Commercial | Services [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0 0  
Performing [Member] | Commercial | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0 0  
Performing [Member] | Commercial | Manufacturing [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0 0  
Performing [Member] | Commercial | Healthcare [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0 0  
Performing [Member] | Commercial | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 24,664 27,870 24,292  
Performing [Member] | Commercial real estate        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0 0  
Performing [Member] | Commercial real estate | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0 0  
Performing [Member] | Commercial real estate | Retail [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0 0  
Performing [Member] | Commercial real estate | Office [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0 0  
Performing [Member] | Commercial real estate | Multifamily [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0 0  
Performing [Member] | Commercial real estate | Industrial [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0 0  
Performing [Member] | Commercial real estate | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 0 0 0  
Performing [Member] | Residential mortgage        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 1,671,097 1,692,925 1,690,107  
Performing [Member] | Residential mortgage | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 794,329 784,928 743,469  
Performing [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 168,997 188,327 194,073  
Performing [Member] | Residential mortgage | Home equity [Member]        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 707,771 719,670 752,565  
Performing [Member] | Personal        
Recorded Investment [Abstract]        
Non-Graded, Recorded Investment 84,680 88,200 98,287  
Performing [Member] | Pass [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 15,076,950 14,797,279 14,325,721  
Performing [Member] | Pass [Member] | Commercial        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 10,499,020 10,226,089 9,517,665  
Performing [Member] | Pass [Member] | Commercial | Energy [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,745,169 2,632,986 1,988,392  
Performing [Member] | Pass [Member] | Commercial | Services [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,872,017 2,943,869 2,960,912  
Performing [Member] | Pass [Member] | Commercial | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,507,322 1,443,917 1,459,703  
Performing [Member] | Pass [Member] | Commercial | Manufacturing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 540,580 472,869 504,824  
Performing [Member] | Pass [Member] | Commercial | Healthcare [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,316,962 2,253,497 2,196,517  
Performing [Member] | Pass [Member] | Commercial | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 516,970 478,951 407,317  
Performing [Member] | Pass [Member] | Commercial real estate        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,473,189 3,463,002 3,852,170  
Performing [Member] | Pass [Member] | Commercial real estate | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 113,894 113,190 132,127  
Performing [Member] | Pass [Member] | Commercial real estate | Retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 728,045 686,915 738,978  
Performing [Member] | Pass [Member] | Commercial real estate | Office [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 729,824 824,408 857,582  
Performing [Member] | Pass [Member] | Commercial real estate | Multifamily [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,008,863 979,969 918,542  
Performing [Member] | Pass [Member] | Commercial real estate | Industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 613,608 573,014 871,387  
Performing [Member] | Pass [Member] | Commercial real estate | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 278,955 285,506 333,554  
Performing [Member] | Pass [Member] | Residential mortgage        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 224,232 232,492 207,886  
Performing [Member] | Pass [Member] | Residential mortgage | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 224,232 232,492 207,886  
Performing [Member] | Pass [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Performing [Member] | Pass [Member] | Residential mortgage | Home equity [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Performing [Member] | Pass [Member] | Personal        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 880,509 875,696 748,000  
Performing [Member] | Other Loans Especially Mentioned [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 78,070 118,175 232,727  
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 45,657 103,324 222,320  
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | Energy [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 10,750 60,288 144,157  
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | Services [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 23,155 13,927 13,931  
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,705 19,263 21,970  
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | Manufacturing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 9,047 6,653 1,917  
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | Healthcare [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 3,186 35,704  
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 7 4,641  
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 30,866 13,303 8,648  
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,828 1,828 0  
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | Retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 21,993 4,243 5,754  
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | Office [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 7,045 7,087 2,894  
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | Multifamily [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | Industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Performing [Member] | Other Loans Especially Mentioned [Member] | Commercial real estate | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 145 0  
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,499 0 1,710  
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,499 0 1,710  
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Performing [Member] | Other Loans Especially Mentioned [Member] | Residential mortgage | Home equity [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Performing [Member] | Other Loans Especially Mentioned [Member] | Personal        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 48 1,548 49  
Performing [Member] | Substandard [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 222,325 241,101 413,156  
Performing [Member] | Substandard [Member] | Commercial        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 218,866 239,389 406,008  
Performing [Member] | Substandard [Member] | Commercial | Energy [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 123,757 144,598 294,138  
Performing [Member] | Substandard [Member] | Commercial | Services [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 31,013 26,533 30,819  
Performing [Member] | Substandard [Member] | Commercial | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 18,985 5,502 13,480  
Performing [Member] | Substandard [Member] | Commercial | Manufacturing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 7,066 11,290 30,782  
Performing [Member] | Substandard [Member] | Commercial | Healthcare [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 27,624 43,305 32,474  
Performing [Member] | Substandard [Member] | Commercial | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 10,421 8,161 4,315  
Performing [Member] | Substandard [Member] | Commercial real estate        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 257 827 5,770  
Performing [Member] | Substandard [Member] | Commercial real estate | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 123 395 1,251  
Performing [Member] | Substandard [Member] | Commercial real estate | Retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 94 98 0  
Performing [Member] | Substandard [Member] | Commercial real estate | Office [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Performing [Member] | Substandard [Member] | Commercial real estate | Multifamily [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 40 48 4,425  
Performing [Member] | Substandard [Member] | Commercial real estate | Industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Performing [Member] | Substandard [Member] | Commercial real estate | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 286 94  
Performing [Member] | Substandard [Member] | Residential mortgage        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,147 822 490  
Performing [Member] | Substandard [Member] | Residential mortgage | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,147 822 490  
Performing [Member] | Substandard [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Performing [Member] | Substandard [Member] | Residential mortgage | Home equity [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Performing [Member] | Substandard [Member] | Personal        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 55 63 888  
Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 135,106 141,334 163,107  
Non-Graded, Recorded Investment 44,958 46,540 44,509  
Nonaccrual [Member] | Commercial        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 131,436 137,233 156,781  
Non-Graded, Recorded Investment 24 70 44  
Nonaccrual [Member] | Commercial | Energy [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 89,942 92,284 110,425  
Non-Graded, Recorded Investment 0 0 0  
Nonaccrual [Member] | Commercial | Services [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,109 2,620 7,713  
Non-Graded, Recorded Investment 0 0 0  
Nonaccrual [Member] | Commercial | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,564 2,574 11,090  
Non-Graded, Recorded Investment 0 0 0  
Nonaccrual [Member] | Commercial | Manufacturing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,002 5,962 5,907  
Non-Graded, Recorded Investment 0 0 0  
Nonaccrual [Member] | Commercial | Healthcare [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 15,342 14,765 909  
Non-Graded, Recorded Investment 0 0 0  
Nonaccrual [Member] | Commercial | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 18,477 19,028 20,737  
Non-Graded, Recorded Investment 24 70 44  
Nonaccrual [Member] | Commercial real estate        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,470 2,855 4,475  
Non-Graded, Recorded Investment 0 0 0  
Nonaccrual [Member] | Commercial real estate | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,613 1,832 2,616  
Non-Graded, Recorded Investment 0 0 0  
Nonaccrual [Member] | Commercial real estate | Retail [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 264 276 314  
Non-Graded, Recorded Investment 0 0 0  
Nonaccrual [Member] | Commercial real estate | Office [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 275 275 413  
Non-Graded, Recorded Investment 0 0 0  
Nonaccrual [Member] | Commercial real estate | Multifamily [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 24  
Non-Graded, Recorded Investment 0 0 0  
Nonaccrual [Member] | Commercial real estate | Industrial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 76  
Non-Graded, Recorded Investment 0 0 0  
Nonaccrual [Member] | Commercial real estate | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 318 472 1,032  
Non-Graded, Recorded Investment 0 0 0  
Nonaccrual [Member] | Residential mortgage        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,118 1,163 1,760  
Non-Graded, Recorded Investment 44,676 46,284 44,321  
Nonaccrual [Member] | Residential mortgage | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,118 1,163 1,760  
Non-Graded, Recorded Investment 23,460 24,030 22,428  
Nonaccrual [Member] | Residential mortgage | Permanent mortgages guaranteed by US government agencies [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Non-Graded, Recorded Investment 8,883 9,179 10,108  
Nonaccrual [Member] | Residential mortgage | Home equity [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0 0  
Non-Graded, Recorded Investment 12,333 13,075 11,785  
Nonaccrual [Member] | Personal        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 82 83 91  
Non-Graded, Recorded Investment $ 258 $ 186 $ 144