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Loans and Allowance for Credit Losses (Aging Analysis of Past Due Loans by Portfolio Class) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans $ 21,846,068 $ 21,134,282 $ 21,148,530
Recorded Investment > 90 Days and Accruing 4,745 5,524  
30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 32,809 42,102  
60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 18,093 12,348  
Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 28,307 37,284  
Total Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 79,209 91,734  
Current [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 21,766,859 21,042,548  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 3,641,243 3,464,626 3,419,028
Recorded Investment > 90 Days and Accruing 1,244    
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 1,440 281  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans   107  
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 loans 2,567 5,307  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Total Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 4,007 5,695  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Current [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 3,637,236 3,458,931  
Total Commercial [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 1,408,727 1,228,670 1,295,036
Recorded Investment > 90 Days and Accruing 53 83  
Total Commercial [Member] | Construction and Land Development [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 214 2,624  
Total Commercial [Member] | Construction and Land Development [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 656 1,022  
Total Commercial [Member] | Construction and Land Development [Member] | Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 346 587  
Total Commercial [Member] | Construction and Land Development [Member] | Total Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 1,216 4,233  
Total Commercial [Member] | Construction and Land Development [Member] | Current [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 1,407,511 1,224,437  
Total Commercial [Member] | Total Commercial And Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 12,609,566 12,433,706 12,342,578
Recorded Investment > 90 Days and Accruing 2,139 2,960  
Total Commercial [Member] | Total Commercial And Industrial [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 20,314 9,085  
Total Commercial [Member] | Total Commercial And Industrial [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 9,621 3,776  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 6,813 8,604  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Total Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 36,748 21,465  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Current [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 12,572,818 12,412,241  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 9,645,092 9,612,460 9,532,710
Recorded Investment > 90 Days and Accruing 1,779 2,818  
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 loans 13,203 8,381  
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 loans 8,585 3,123  
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 loans 5,735 7,041  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 27,523 18,545  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Current [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 9,617,569 9,593,915  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 2,964,474 2,821,246 2,809,868
Recorded Investment > 90 Days and Accruing 360 142  
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 loans 7,111 704  
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 loans 1,036 653  
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 loans 1,078 1,563  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 9,225 2,920  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Current [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 2,955,249 2,818,326  
Residential Mortgages [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 2,615,807 2,423,890 2,412,459
Recorded Investment > 90 Days and Accruing 150 310  
Residential Mortgages [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 4,366 23,306  
Residential Mortgages [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 5,489 4,638  
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 14,175 15,339  
Residential Mortgages [Member] | Total Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 24,030 43,283  
Residential Mortgages [Member] | Current [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 2,591,777 2,380,607  
Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 1,570,725 1,583,390 $ 1,679,429
Recorded Investment > 90 Days and Accruing 1,159 2,171  
Consumer [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 6,475 6,806  
Consumer [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 2,327 2,805  
Consumer [Member] | Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 4,406 7,447  
Consumer [Member] | Total Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 13,208 17,058  
Consumer [Member] | Current [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans $ 1,557,517 $ 1,566,332