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Loans and Leases (Aging Of The Outstanding Loans and Leases By Class) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans $ 703,837 $ 762,998 $ 848,816 $ 809,169
Commercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 355,928 393,419    
Non-PCI loans 14,871,562 14,799,054    
Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 9,316 10,135    
Non-PCI loans 738,413 669,215    
Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 325,073 358,103    
Non-PCI loans 9,859,136 9,729,022    
Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 16,179 17,124    
Non-PCI loans 386,734 473,433    
Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 3,732 6,374    
Non-PCI loans 2,695,205 2,730,407    
Commercial | Lease financing        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Non-PCI loans 910,589 894,801    
Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 1,628 1,683    
Non-PCI loans 281,485 302,176    
Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 347,909 369,579    
Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 3,006 4,163    
Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 282,338 299,318    
Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 60,388 63,908    
Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 2,177 2,190    
PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
PCI loans 703,837 762,998    
PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Current loans 307,843 318,632    
PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Current loans 2,420 3,521    
PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Current loans 249,443 257,166    
PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Current loans 53,885 55,871    
PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Current loans 2,095 2,074    
Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 127,286 144,872    
Current loans 22,780,854 22,688,955    
Non-PCI loans 22,908,140 22,833,827    
Non-PCI Loans | Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 3,139 1,290    
Current loans 735,274 667,925    
Non-PCI loans 738,413 669,215    
Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 21,609 21,153    
Current loans 9,837,527 9,707,869    
Non-PCI loans 9,859,136 9,729,022    
Non-PCI Loans | Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 189 182    
Current loans 386,545 473,251    
Non-PCI loans 386,734 473,433    
Non-PCI Loans | Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 11,620 9,470    
Current loans 2,683,585 2,720,937    
Non-PCI loans 2,695,205 2,730,407    
Non-PCI Loans | Commercial | Lease financing        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 5,234 4,123    
Current loans 905,355 890,678    
Non-PCI loans 910,589 894,801    
Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 222 327    
Current loans 281,263 301,849    
Non-PCI loans 281,485 302,176    
Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Current loans 7,951,305 7,926,446    
Non-PCI loans 8,036,578 8,034,773    
Non-PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 4,007 8,641    
Current loans 239,107 239,648    
Non-PCI loans 243,114 248,289    
Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 45,464 57,851    
Current loans 3,542,327 3,465,935    
Non-PCI loans 3,587,791 3,523,786    
Non-PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 23,526 27,135    
Current loans 2,628,122 2,674,390    
Non-PCI loans 2,651,648 2,701,525    
Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 12,276 14,700    
Current loans 1,541,749 1,546,473    
Non-PCI loans 1,554,025 1,561,173    
90 Days or greater | PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 26,862 31,392    
90 Days or greater | PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 567 0    
90 Days or greater | PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 22,263 26,781    
90 Days or greater | PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 3,990 4,569    
90 Days or greater | PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 42 42    
90 Days or greater | Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 44,383 45,791    
90 Days or greater | Non-PCI Loans | Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 357 357    
90 Days or greater | Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 7,058 6,490    
90 Days or greater | Non-PCI Loans | Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 73 75    
90 Days or greater | Non-PCI Loans | Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,503 1,266    
90 Days or greater | Non-PCI Loans | Commercial | Lease financing        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,512 973    
90 Days or greater | Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 129 133    
90 Days or greater | Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 33,751 36,497    
90 Days or greater | Non-PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,122 1,379    
90 Days or greater | Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 19,202 21,901    
90 Days or greater | Non-PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 10,526 10,222    
90 Days or greater | Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 2,901 2,995    
60 to 89 Days past due | PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 2,287 6,212    
60 to 89 Days past due | PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 0 642    
60 to 89 Days past due | PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,436 4,846    
60 to 89 Days past due | PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 851 701    
60 to 89 Days past due | PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 0 23    
60 to 89 Days past due | Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 15,972 19,050    
60 to 89 Days past due | Non-PCI Loans | Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 771 442    
60 to 89 Days past due | Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 4,738 2,375    
60 to 89 Days past due | Non-PCI Loans | Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 22 0    
60 to 89 Days past due | Non-PCI Loans | Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,844 1,510    
60 to 89 Days past due | Non-PCI Loans | Commercial | Lease financing        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 45 167    
60 to 89 Days past due | Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 47 6    
60 to 89 Days past due | Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 8,505 14,550    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 0 108    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 2,429 8,064    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 3,636 3,485    
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 2,440 2,893    
30 to 59 Days past due | PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 10,917 13,343    
30 to 59 Days past due | PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 19 0    
30 to 59 Days past due | PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 9,196 10,525    
30 to 59 Days past due | PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 1,662 2,767    
30 to 59 Days past due | PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 40 51    
30 to 59 Days past due | Non-PCI Loans        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 66,931 80,031    
30 to 59 Days past due | Non-PCI Loans | Commercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 2,011 491    
30 to 59 Days past due | Non-PCI Loans | Commercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 9,813 12,288    
30 to 59 Days past due | Non-PCI Loans | Commercial | Other commercial real estate        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 94 107    
30 to 59 Days past due | Non-PCI Loans | Commercial | Commercial and industrial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 8,273 6,694    
30 to 59 Days past due | Non-PCI Loans | Commercial | Lease financing        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 3,677 2,983    
30 to 59 Days past due | Non-PCI Loans | Commercial | Other        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 46 188    
30 to 59 Days past due | Non-PCI Loans | Noncommercial        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 43,017 57,280    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Construction and land development        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 2,885 7,154    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 23,833 27,886    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans 9,364 13,428    
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Consumer        
Financing Receivable, Recorded Investment, Past Due [Line Items]        
Past due loans $ 6,935 $ 8,812