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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, 2023
Dec. 31, 2022
Mar. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans $ 23,404,523 $ 23,114,046 $ 21,323,341
Recorded Investment > 90 Days and Accruing 13,155 4,585  
30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 73,333 65,080  
60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 31,975 38,779  
Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 34,845 28,372  
Total Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 140,153 132,231  
Current [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 23,264,370 22,981,815  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 3,758,455 3,560,991 3,563,299
Recorded Investment > 90 Days and Accruing 1,214    
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 175 879  
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 2,653 1,174  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Total Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 2,828 2,053  
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Current [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 3,755,627 3,558,938  
Total Commercial [Member] | Construction and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 1,726,916 1,703,592 1,286,655
Recorded Investment > 90 Days and Accruing 126 54  
Total Commercial [Member] | Construction and Land Development [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 2,304 4,029  
Total Commercial [Member] | Construction and Land Development [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 359 242  
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 217 133  
Total Commercial [Member] | Construction and Land Development [Member] | Total Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 2,880 4,404  
Total Commercial [Member] | Construction and Land Development [Member] | Current [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 1,724,036 1,699,188  
Total Commercial [Member] | Total Commercial And Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 13,064,230 13,179,511 12,452,713
Recorded Investment > 90 Days and Accruing 9,891 2,619  
Total Commercial [Member] | Total Commercial And Industrial [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 34,361 23,119  
Total Commercial [Member] | Total Commercial And Industrial [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 19,055 24,675  
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 13,596 5,312  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Total Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 67,012 53,106  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Current [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 12,997,218 13,126,405  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 10,013,482 10,146,453 9,584,480
Recorded Investment > 90 Days and Accruing 8,492 996  
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 31,691 4,050  
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 17,026 21,329  
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 11,029 3,418  
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 59,746 28,797  
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 9,953,736 10,117,656  
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 3,050,748 3,033,058 2,868,233
Recorded Investment > 90 Days and Accruing 1,399 1,623  
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 2,670 19,069  
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 2,029 3,346  
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 2,567 1,894  
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 7,266 24,309  
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 3,043,482 3,008,749  
Residential Mortgages [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 3,329,793 3,092,605 2,462,900
Recorded Investment > 90 Days and Accruing 167 293  
Residential Mortgages [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 29,903 28,208  
Residential Mortgages [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 8,055 11,056  
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 13,684 17,346  
Residential Mortgages [Member] | Total Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 51,642 56,610  
Residential Mortgages [Member] | Current [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 3,278,151 3,035,995  
Consumer [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 1,525,129 1,577,347 $ 1,557,774
Recorded Investment > 90 Days and Accruing 1,757 1,619  
Consumer [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 6,590 8,845  
Consumer [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 4,506 2,806  
Consumer [Member] | Greater Than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 4,695 4,407  
Consumer [Member] | Total Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans 15,791 16,058  
Consumer [Member] | Current [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total loans $ 1,509,338 $ 1,561,289