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Loans and Allowance for Credit Losses (Aging Analysis of Past Due Loans by Portfolio Class) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 218,965 $ 260,818  
Current 22,021,239 20,951,937  
Total loans 22,240,204 21,212,755 $ 21,035,952
Recorded Investment > 90 Days and Accruing 10,439 6,582  
30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 20,417 83,693  
60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 63,428 30,183  
Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 135,120 146,942  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 39,104 4,351  
Current 3,367,450 2,990,097  
Total loans 3,406,554 2,994,448 3,060,568
Recorded Investment > 90 Days and Accruing 2,490 450  
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 165 738  
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 30,238 703  
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 8,701 2,910  
Total Commercial [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 4,491 8,907  
Current 1,091,658 1,148,544  
Total loans 1,096,149 1,157,451 1,190,718
Recorded Investment > 90 Days and Accruing 393 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 1,076 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 237 680  
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 3,178 2,480  
Total Commercial [Member] | Total Commercial And Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 100,527 147,830  
Current 12,936,668 11,757,577  
Total loans 13,037,195 11,905,407 11,627,383
Recorded Investment > 90 Days and Accruing 5,223 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 6,561 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 16,553 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 77,413 108,074  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 86,008 135,144  
Current 10,171,780 9,031,803  
Total loans 10,257,788 9,166,947 8,893,004
Recorded Investment > 90 Days and Accruing 5,110 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 6,026 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 14,277 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 65,705 100,806  
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 14,519 12,686  
Current 2,764,888 2,725,774  
Total loans 2,779,407 2,738,460 2,734,379
Recorded Investment > 90 Days and Accruing 113 830  
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 535 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 2,276 556  
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 11,708 7,268  
Residential Mortgages [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 47,851 65,028  
Current 2,706,537 2,925,603  
Total loans 2,754,388 2,990,631 3,004,958
Recorded Investment > 90 Days and Accruing 1,818 85  
Residential Mortgages [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 3,164 32,867  
Residential Mortgages [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 11,779 8,584  
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 32,908 23,577  
Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 26,992 34,702  
Current 1,918,926 2,130,116  
Total loans 1,945,918 2,164,818 $ 2,152,325
Recorded Investment > 90 Days and Accruing 515 1,638  
Consumer [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 9,451 18,586  
Consumer [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 4,621 6,215  
Consumer [Member] | Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 12,920 $ 9,901