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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, 2026
Dec. 31, 2025
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans $ 23,991,840 $ 23,958,440
Recorded Investment > 90 Days and Still Accruing 29,885 28,798
30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 115,114 88,351
60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 64,995 69,653
Greater Than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 101,881 102,723
Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 281,990 260,727
Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 23,709,850 23,697,713
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 4,382,665 4,283,168
Recorded Investment > 90 Days and Still Accruing 4,312 2,928
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 15,891 990
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 1,360 2,806
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 5,842 7,177
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 23,093 10,973
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 4,359,572 4,272,195
Total Commercial [Member] | Construction and Land Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 1,320,224 1,239,086
Recorded Investment > 90 Days and Still Accruing 147 565
Total Commercial [Member] | Construction and Land Development [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 3,189 1,754
Total Commercial [Member] | Construction and Land Development [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 247 564
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 1,090 3,488
Total Commercial [Member] | Construction and Land Development [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 4,526 5,806
Total Commercial [Member] | Construction and Land Development [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 1,315,698 1,233,280
Total Commercial [Member] | Total Commercial And Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 13,010,758 13,079,091
Recorded Investment > 90 Days and Still Accruing 23,340 21,944
Total Commercial [Member] | Total Commercial And Industrial [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 34,226 34,021
Total Commercial [Member] | Total Commercial And Industrial [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 45,868 43,624
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 57,942 47,563
Total Commercial [Member] | Total Commercial And Industrial [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 138,036 125,208
Total Commercial [Member] | Total Commercial And Industrial [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 12,872,722 12,953,883
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 9,710,891 9,809,011
Recorded Investment > 90 Days and Still Accruing 15,105 20,358
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 28,794 19,008
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 18,882 43,316
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 44,631 39,954
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 92,307 102,278
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 9,618,584 9,706,733
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 3,299,867 3,270,080
Recorded Investment > 90 Days and Still Accruing 8,235 1,586
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 5,432 15,013
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 26,986 308
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 13,311 7,609
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 45,729 22,930
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 3,254,138 3,247,150
Residential Mortgages [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 3,950,154 4,016,917
Recorded Investment > 90 Days and Still Accruing 70 116
Residential Mortgages [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 52,593 42,302
Residential Mortgages [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 13,821 17,984
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 27,965 34,656
Residential Mortgages [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 94,379 94,942
Residential Mortgages [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 3,855,775 3,921,975
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 1,328,039 1,340,178
Recorded Investment > 90 Days and Still Accruing 2,016 3,245
Consumer [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 9,215 9,284
Consumer [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 3,699 4,675
Consumer [Member] | Greater Than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 9,042 9,839
Consumer [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 21,956 23,798
Consumer [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans $ 1,306,083 $ 1,316,380