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Loans And Allowance For Credit Losses (Summary Of Outstanding Loan Balances (Accruing And Nonaccruing) Categorized By Credit Quality Indicators) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 6,746 $ 2,424 $ 180,300 $ 74,500  
Financing Receivable, Recorded Investment, Current 41,131,196   41,131,196   $ 40,363,353
Loans held for sale 108,764   108,764   149,880
Commercial and industrial 13,590,238   13,590,238   13,211,481
Leasing 437,150   437,150   441,666
Owner occupied 7,022,429   7,022,429   7,150,028
Municipal 695,436   695,436   675,839
Total commercial 21,745,253   21,745,253   21,479,014
Construction and land development 1,967,702   1,967,702   1,841,502
Term 8,826,375   8,826,375   8,514,401
Loans Receivable, Gross, Commercial, Real Estate 10,794,077   10,794,077   10,355,903
Loans and Leases Receivable, Gross, Consumer, Home Equity 2,432,632   2,432,632   2,416,357
1-4 family residential 5,417,810   5,417,810   5,382,099
Loans and Leases Receivable, Gross, Consumer, Construction 401,422   401,422   385,240
Bankcard and other revolving plans 438,540   438,540   443,780
Other 188,451   188,451   187,149
Total consumer 8,878,855   8,878,855   8,814,625
Total loans 41,418,185   41,418,185   40,649,542
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 149,270   149,270   147,980
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 137,719   137,719   138,209
Financing Receivable, Recorded Investment, Past Due 286,989   286,989   286,189
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 37,202   37,202   32,024
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 392,322   392,322   217,427
Consumer Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans and Leases Receivable, Gross, Consumer, Home Equity 2,432,632   2,432,632   2,416,357
1-4 family residential 5,417,810   5,417,810   5,382,099
Loans and Leases Receivable, Gross, Consumer, Construction 401,422   401,422   385,240
Bankcard and other revolving plans 438,540   438,540   443,780
Other 188,451   188,451   187,149
Total consumer 8,878,855   8,878,855   8,814,625
Total loans 8,878,855   8,878,855   8,814,625
Financing Receivable, Recorded Investment, Nonaccrual Status 202   202   186
Commercial Real Estate [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 $ 1,284      
Construction and land development 1,967,702   1,967,702   1,841,502
Term 8,826,375   8,826,375   8,514,401
Loans Receivable, Gross, Commercial, Real Estate 10,794,077   10,794,077   10,355,903
Financing Receivable, Recorded Investment, Nonaccrual Status 6,152   6,152   7,045
Commercial [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Commercial and industrial 13,590,238   13,590,238   13,211,481
Leasing 437,150   437,150   441,666
Owner occupied 7,022,429   7,022,429   7,150,028
Municipal 695,436   695,436   675,839
Total commercial 21,745,253   21,745,253   21,479,014
Total loans 21,745,253   21,745,253   21,479,014
Pass [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Total loans 39,267,777   39,267,777   38,647,130
Pass [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans and Leases Receivable, Gross, Consumer, Home Equity 2,418,415   2,418,415   2,404,635
1-4 family residential 5,368,085   5,368,085   5,325,519
Loans and Leases Receivable, Gross, Consumer, Construction 399,765   399,765   381,738
Bankcard and other revolving plans 433,989   433,989   440,282
Other 188,099   188,099   186,836
Total consumer 8,808,353   8,808,353   8,739,010
Pass [Member] | Commercial Real Estate [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Construction and land development 1,921,338   1,921,338   1,786,610
Term 8,634,484   8,634,484   8,319,348
Loans Receivable, Gross, Commercial, Real Estate 10,555,822   10,555,822   10,105,958
Pass [Member] | Commercial [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Commercial and industrial 12,245,903   12,245,903   12,007,076
Leasing 402,160   402,160   411,131
Owner occupied 6,577,162   6,577,162   6,720,052
Municipal 678,377   678,377   663,903
Total commercial 19,903,602   19,903,602   19,802,162
Special Mention [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Total loans 618,356   618,356   634,390
Special Mention [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans and Leases Receivable, Gross, Consumer, Home Equity 0   0   0
1-4 family residential 0   0   0
Loans and Leases Receivable, Gross, Consumer, Construction 0   0   0
Bankcard and other revolving plans 0   0   0
Other 0   0   0
Total consumer 0   0   0
Special Mention [Member] | Commercial Real Estate [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Construction and land development 14,540   14,540   42,348
Term 41,331   41,331   47,245
Loans Receivable, Gross, Commercial, Real Estate 55,871   55,871   89,593
Special Mention [Member] | Commercial [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Commercial and industrial 390,768   390,768   399,847
Leasing 7,106   7,106   5,166
Owner occupied 156,723   156,723   139,784
Municipal 7,888   7,888   0
Total commercial 562,485   562,485   544,797
Total Allowance [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Total loans 611,894   611,894   606,048
Total Allowance [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Total consumer 30,195   30,195   37,779
Total Allowance [Member] | Commercial Real Estate [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans Receivable, Gross, Commercial, Real Estate 117,712   117,712   113,992
Total Allowance [Member] | Commercial [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Total commercial 463,987   463,987   454,277
Doubtful [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Total loans 251   251   8,927
Doubtful [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans and Leases Receivable, Gross, Consumer, Home Equity 0   0   0
1-4 family residential 0   0   0
Loans and Leases Receivable, Gross, Consumer, Construction 0   0   0
Bankcard and other revolving plans 0   0   0
Other 0   0   0
Total consumer 0   0   0
Doubtful [Member] | Commercial Real Estate [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Construction and land development 0   0   0
Term 0   0   8,772
Loans Receivable, Gross, Commercial, Real Estate 0   0   8,772
Doubtful [Member] | Commercial [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Commercial and industrial 251   251   155
Leasing 0   0   0
Owner occupied 0   0   0
Municipal 0   0   0
Total commercial 251   251   155
Substandard [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Total loans 1,531,801   1,531,801   1,359,095
Substandard [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Loans and Leases Receivable, Gross, Consumer, Home Equity 14,217   14,217   11,722
1-4 family residential 49,725   49,725   56,580
Loans and Leases Receivable, Gross, Consumer, Construction 1,657   1,657   3,502
Bankcard and other revolving plans 4,551   4,551   3,498
Other 352   352   313
Total consumer 70,502   70,502   75,615
Substandard [Member] | Commercial Real Estate [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Construction and land development 31,824   31,824   12,544
Term 150,560   150,560   139,036
Loans Receivable, Gross, Commercial, Real Estate 182,384   182,384   151,580
Substandard [Member] | Commercial [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Commercial and industrial 953,316   953,316   804,403
Leasing 27,884   27,884   25,369
Owner occupied 288,544   288,544   290,192
Municipal 9,171   9,171   11,936
Total commercial 1,278,915   1,278,915   1,131,900
Consumer Loan [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 8,827,112   8,827,112   8,750,302
Total loans 8,878,855   8,878,855   8,814,625
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 23,868   23,868   30,646
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 27,875   27,875   33,677
Financing Receivable, Recorded Investment, Past Due 51,743   51,743   64,323
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 1,169   1,169   3,590
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 26,508   26,508   24,629
Consumer Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 187,760   187,760   186,436
Total loans 188,451   188,451   187,149
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 630   630   647
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 61   61   66
Financing Receivable, Recorded Investment, Past Due 691   691   713
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0   0
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 78   78   83
Term [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 8,782,301   8,782,301   8,469,390
Total loans 8,826,375   8,826,375   8,514,401
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 10,173   10,173   10,424
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 33,901   33,901   34,587
Financing Receivable, Recorded Investment, Past Due 44,074   44,074   45,011
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 18,295   18,295   21,697
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 15,791   15,791   24,867
Commercial Real Estate [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 1,960,562   1,960,562   1,835,360
Total loans 1,967,702   1,967,702   1,841,502
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 2,573   2,573   842
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 4,567   4,567   5,300
Financing Receivable, Recorded Investment, Past Due 7,140   7,140   6,142
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0   0
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 1,533   1,533   1,745
Commercial and Industrial Sector [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 13,464,106   13,464,106   13,114,045
Total loans 13,590,238   13,590,238   13,211,481
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 90,610   90,610   60,523
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 35,522   35,522   36,913
Financing Receivable, Recorded Investment, Past Due 126,132   126,132   97,436
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 4,388   4,388   3,065
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 287,662   287,662   117,942
Finance Leases Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 436,597   436,597   440,963
Total loans 437,150   437,150   441,666
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 59   59   183
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 494   494   520
Financing Receivable, Recorded Investment, Past Due 553   553   703
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0   0
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 13,613   13,613   3,309
Owner Occupied [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 6,965,082   6,965,082   7,085,086
Total loans 7,022,429   7,022,429   7,150,028
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 21,987   21,987   37,776
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 35,360   35,360   27,166
Financing Receivable, Recorded Investment, Past Due 57,347   57,347   64,942
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 13,350   13,350   3,626
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 46,289   46,289   43,984
Municipal [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 695,436   695,436   668,207
Total loans 695,436   695,436   675,839
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 0   0   7,586
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 0   0   46
Financing Receivable, Recorded Investment, Past Due 0   0   7,632
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0   46
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 926   926   951
Commercial Real Estate [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 10,742,863   10,742,863   10,304,750
Total loans 10,794,077   10,794,077   10,355,903
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 12,746   12,746   11,266
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 38,468   38,468   39,887
Financing Receivable, Recorded Investment, Past Due 51,214   51,214   51,153
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 18,295   18,295   21,697
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 17,324   17,324   26,612
Home Equity Line of Credit [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 2,420,364   2,420,364   2,407,972
Total loans 2,432,632   2,432,632   2,416,357
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 7,015   7,015   4,717
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 5,253   5,253   3,668
Financing Receivable, Recorded Investment, Past Due 12,268   12,268   8,385
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0   0
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 4,604   4,604   3,053
Commercial Loan [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 21,561,221   21,561,221   21,308,301
Total loans 21,745,253   21,745,253   21,479,014
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 112,656   112,656   106,068
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 71,376   71,376   64,645
Financing Receivable, Recorded Investment, Past Due 184,032   184,032   170,713
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 17,738   17,738   6,737
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 348,490   348,490   166,186
One Through Four Family Residential [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 5,386,087   5,386,087   5,340,549
Total loans 5,417,810   5,417,810   5,382,099
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 10,617   10,617   14,828
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 21,106   21,106   26,722
Financing Receivable, Recorded Investment, Past Due 31,723   31,723   41,550
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 321   321   1,036
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 20,131   20,131   20,939
Construction And Other Consumer Real Estate [Member]          
Financing Receivable, Allowance for Credit Losses [Line Items]          
Financing Receivable, Recorded Investment, Current 397,809   397,809   374,987
Total loans 401,422   401,422   385,240
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 3,365   3,365   8,593
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 248   248   1,660
Financing Receivable, Recorded Investment, Past Due 3,613   3,613   10,253
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0   0   1,337
Financing Receivable, Recorded Investment, Nonaccrual Status [1] $ 355   $ 355   $ 408
[1] 1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.