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Loans and Allowances for Credit Losses, Credit Quality Indicators (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment $ 14,150,992 $ 12,336,710    
Non-Graded, Recorded Investment 1,790,162 1,871,327    
Total 15,941,154 14,208,037    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 175,090 137,032    
Non-Graded, Related Allowance 20,308 23,979    
Total, Related Allowance 225,524 189,056 $ 185,396 $ 215,507
Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 13,908,728 12,222,486    
Non-Graded, Recorded Investment 1,730,775 1,825,709    
Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 154,523 79,071    
Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 87,741 35,153    
Non-Graded, Recorded Investment 59,387 45,618    
Commercial [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 10,227,303 9,073,030    
Non-Graded, Recorded Investment 25,228 22,640    
Total 10,252,531 9,095,670    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 129,426 90,085    
Non-Graded, Related Allowance 908 790    
Total, Related Allowance 130,334 90,875 79,180 65,280
Commercial [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 10,006,226 9,008,360    
Non-Graded, Recorded Investment 25,101 22,532    
Commercial [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 144,780 51,251    
Commercial [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 76,297 13,419    
Non-Graded, Recorded Investment 127 108    
Commercial [Member] | Energy [Member]        
Recorded Investment [Abstract]        
Total 3,097,328 2,860,428    
Commercial [Member] | Energy [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,906,357 2,843,093    
Non-Graded, Recorded Investment 0 0    
Commercial [Member] | Energy [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 129,782 15,919    
Commercial [Member] | Energy [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 61,189 1,416    
Non-Graded, Recorded Investment 0 0    
Commercial [Member] | Services [Member]        
Recorded Investment [Abstract]        
Total 2,784,276 2,391,530    
Commercial [Member] | Services [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,767,225 2,371,189    
Non-Graded, Recorded Investment 0 0    
Commercial [Member] | Services [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 6,761 15,140    
Commercial [Member] | Services [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 10,290 5,201    
Non-Graded, Recorded Investment 0 0    
Commercial [Member] | Healthcare [Member]        
Recorded Investment [Abstract]        
Total 1,883,380 1,454,969    
Commercial [Member] | Healthcare [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,882,308 1,449,024    
Non-Graded, Recorded Investment 0 0    
Commercial [Member] | Healthcare [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 4,565    
Commercial [Member] | Healthcare [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,072 1,380    
Non-Graded, Recorded Investment 0 0    
Commercial [Member] | Wholesale/retail [Member]        
Recorded Investment [Abstract]        
Total 1,422,064 1,440,015    
Commercial [Member] | Wholesale/retail [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,412,780 1,427,725    
Non-Graded, Recorded Investment 0 0    
Commercial [Member] | Wholesale/retail [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 6,365 8,141    
Commercial [Member] | Wholesale/retail [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,919 4,149    
Non-Graded, Recorded Investment 0 0    
Commercial [Member] | Manufacturing [Member]        
Recorded Investment [Abstract]        
Total 556,729 532,594    
Commercial [Member] | Manufacturing [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 554,526 527,951    
Non-Graded, Recorded Investment 0 0    
Commercial [Member] | Manufacturing [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,872 4,193    
Commercial [Member] | Manufacturing [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 331 450    
Non-Graded, Recorded Investment 0 0    
Commercial [Member] | Other commercial and industrial [Member]        
Recorded Investment [Abstract]        
Total 508,754 416,134    
Commercial [Member] | Other commercial and industrial [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 483,030 389,378    
Non-Graded, Recorded Investment 25,101 22,532    
Commercial [Member] | Other commercial and industrial [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 3,293    
Commercial [Member] | Other commercial and industrial [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 496 823    
Non-Graded, Recorded Investment 127 108    
Commercial Real Estate [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,259,033 2,728,150    
Non-Graded, Recorded Investment 0 0    
Total 3,259,033 2,728,150    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 41,391 42,445    
Non-Graded, Related Allowance 0 0    
Total, Related Allowance 41,391 42,445 41,573 54,884
Commercial Real Estate [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 3,242,235 2,683,565    
Non-Graded, Recorded Investment 0 0    
Commercial Real Estate [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 7,797 26,028    
Commercial Real Estate [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 9,001 18,557    
Non-Graded, Recorded Investment 0 0    
Commercial Real Estate [Member] | Retail [Member]        
Recorded Investment [Abstract]        
Total 796,499 666,889    
Commercial Real Estate [Member] | Retail [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 794,754 662,335    
Non-Graded, Recorded Investment 0 0    
Commercial Real Estate [Member] | Retail [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 426 628    
Commercial Real Estate [Member] | Retail [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,319 3,926    
Non-Graded, Recorded Investment 0 0    
Commercial Real Estate [Member] | Multifamily [Member]        
Recorded Investment [Abstract]        
Total 751,085 704,298    
Commercial Real Estate [Member] | Multifamily [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 744,299 691,053    
Non-Graded, Recorded Investment 0 0    
Commercial Real Estate [Member] | Multifamily [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 6,512 13,245    
Commercial Real Estate [Member] | Multifamily [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 274 0    
Non-Graded, Recorded Investment 0 0    
Commercial Real Estate [Member] | Office [Member]        
Recorded Investment [Abstract]        
Total 637,707 415,544    
Commercial Real Estate [Member] | Office [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 636,501 411,548    
Non-Graded, Recorded Investment 0 0    
Commercial Real Estate [Member] | Office [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 555 576    
Commercial Real Estate [Member] | Office [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 651 3,420    
Non-Graded, Recorded Investment 0 0    
Commercial Real Estate [Member] | Industrial [Member]        
Recorded Investment [Abstract]        
Total 563,169 428,817    
Commercial Real Estate [Member] | Industrial [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 563,093 428,817    
Non-Graded, Recorded Investment 0 0    
Commercial Real Estate [Member] | Industrial [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Commercial Real Estate [Member] | Industrial [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 76 0    
Non-Graded, Recorded Investment 0 0    
Commercial Real Estate [Member] | Residential construction and land development [Member]        
Recorded Investment [Abstract]        
Total 160,426 143,591    
Commercial Real Estate [Member] | Residential construction and land development [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 155,724 127,437    
Non-Graded, Recorded Investment 0 0    
Commercial Real Estate [Member] | Residential construction and land development [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 293 10,855    
Commercial Real Estate [Member] | Residential construction and land development [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 4,409 5,299    
Non-Graded, Recorded Investment 0 0    
Commercial Real Estate [Member] | Other commercial real estate [Member]        
Recorded Investment [Abstract]        
Total 350,147 369,011    
Commercial Real Estate [Member] | Other commercial real estate [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 347,864 362,375    
Non-Graded, Recorded Investment 0 0    
Commercial Real Estate [Member] | Other commercial real estate [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 11 724    
Commercial Real Estate [Member] | Other commercial real estate [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,272 5,912    
Non-Graded, Recorded Investment 0 0    
Residential Mortgage [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 196,701 192,303    
Non-Graded, Recorded Investment 1,680,192 1,757,209    
Total 1,876,893 1,949,512    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 2,883 2,996    
Non-Graded, Related Allowance 16,626 20,462    
Total, Related Allowance 19,509 23,458 29,465 41,703
Residential Mortgage [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 192,456 187,520    
Non-Graded, Recorded Investment 1,621,265 1,712,098    
Residential Mortgage [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,932 1,773    
Residential Mortgage [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,313 3,010    
Non-Graded, Recorded Investment 58,927 45,111    
Residential Mortgage [Member] | Permanent mortgage [Member]        
Recorded Investment [Abstract]        
Total 945,336 969,951    
Residential Mortgage [Member] | Permanent mortgage [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 192,456 187,520    
Non-Graded, Recorded Investment 721,964 745,813    
Residential Mortgage [Member] | Permanent mortgage [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 1,932 1,773    
Residential Mortgage [Member] | Permanent mortgage [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 2,313 3,010    
Non-Graded, Recorded Investment 26,671 31,835    
Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member]        
Recorded Investment [Abstract]        
Total 196,937 205,950    
Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Non-Graded, Recorded Investment 175,037 202,238    
Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Residential Mortgage [Member] | Permanent mortgages guaranteed by U.S. government agencies [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Non-Graded, Recorded Investment 21,900 3,712    
Residential Mortgage [Member] | Home equity [Member]        
Recorded Investment [Abstract]        
Total 734,620 773,611    
Residential Mortgage [Member] | Home equity [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Non-Graded, Recorded Investment 724,264 764,047    
Residential Mortgage [Member] | Home equity [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Residential Mortgage [Member] | Home equity [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Non-Graded, Recorded Investment 10,356 9,564    
Personal [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 467,955 343,227    
Non-Graded, Recorded Investment 84,742 91,478    
Total 552,697 434,705    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 1,390 1,506    
Non-Graded, Related Allowance 2,774 2,727    
Total, Related Allowance 4,164 4,233 6,965 9,453
Personal [Member] | Performing [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 467,811 343,041    
Non-Graded, Recorded Investment 84,409 91,079    
Personal [Member] | Potential Problem [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 14 19    
Personal [Member] | Nonaccrual [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 130 167    
Non-Graded, Recorded Investment 333 399    
Specific Allowance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 14,150,992 12,336,710    
Non-Graded, Recorded Investment 1,790,162 1,871,327    
Total 15,941,154 14,208,037    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 175,090 137,032    
Non-Graded, Related Allowance 20,308 23,979    
Total, Related Allowance 195,398 161,011    
Nonspecific Allowance [Member]        
Recorded Investment [Abstract]        
Internally Risk Graded, Recorded Investment 0 0    
Non-Graded, Recorded Investment 0 0    
Total 0 0    
Related Allowance [Abstract]        
Internally Risk Graded, Related Allowance 0 0    
Non-Graded, Related Allowance 0 0    
Total, Related Allowance $ 30,126 $ 28,045 $ 28,213 $ 44,187