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Loans and Allowance for Credit Losses (Aging Analysis of Past Due Loans by Portfolio Class) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 307,348 $ 260,818  
Current 21,208,333 20,951,937  
Total loans 21,515,681 21,212,755 $ 20,112,838
Recorded Investment > 90 Days and Accruing 17,790 6,582  
30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 114,485 83,693  
60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 18,031 30,183  
Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 174,832 146,942  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 18,237 4,351  
Current 3,214,546 2,990,097  
Total loans 3,232,783 2,994,448 2,563,394
Recorded Investment > 90 Days and Accruing 4,221 450  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 8,727 738  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 80 703  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 9,430 2,910  
Total Commercial [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 11,039 8,907  
Current 1,087,687 1,148,544  
Total loans 1,098,726 1,157,451 1,340,067
Recorded Investment > 90 Days and Accruing 667 2,042  
Total Commercial [Member] | Construction and Land Development [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 6,289 5,747  
Total Commercial [Member] | Construction and Land Development [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 344 680  
Total Commercial [Member] | Construction and Land Development [Member] | Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 4,406 2,480  
Total Commercial [Member] | Total Commercial And Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 165,265 147,830  
Current 11,887,395 11,757,577  
Total loans 12,052,660 11,905,407 11,171,754
Recorded Investment > 90 Days and Accruing 11,579 2,367  
Total Commercial [Member] | Total Commercial And Industrial [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 28,772 25,755  
Total Commercial [Member] | Total Commercial And Industrial [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 8,432 14,001  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 128,061 108,074  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 147,870 135,144  
Current 9,173,470 9,031,803  
Total loans 9,321,340 9,166,947 8,656,326
Recorded Investment > 90 Days and Accruing 6,832 1,537  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 23,478 20,893  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 7,629 13,445  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 116,763 100,806  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 17,395 12,686  
Current 2,713,925 2,725,774  
Total loans 2,731,320 2,738,460 2,515,428
Recorded Investment > 90 Days and Accruing 4,747 830  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 5,294 4,862  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 803 556  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 11,298 7,268  
Residential Mortgages [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 71,484 65,028  
Current 2,908,501 2,925,603  
Total loans 2,979,985 2,990,631 2,933,251
Recorded Investment > 90 Days and Accruing 64 85  
Residential Mortgages [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 46,695 32,867  
Residential Mortgages [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,305 8,584  
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 23,484 23,577  
Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 41,323 34,702  
Current 2,110,204 2,130,116  
Total loans 2,151,527 2,164,818 $ 2,104,372
Recorded Investment > 90 Days and Accruing 1,259 1,638  
Consumer [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 24,002 18,586  
Consumer [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 7,870 6,215  
Consumer [Member] | Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 9,451 $ 9,901