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Loans and Allowance for Credit Losses (Credit Quality Indicators by Segment and Portfolio Class) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Total Commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans $ 18,713,647 $ 18,601,345
Total Commercial [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 13,010,758 13,079,091
Total Commercial [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 17,640,746 17,451,198
Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 12,239,542 12,244,949
Total Commercial [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 550,702 614,792
Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 324,457 389,493
Total Commercial [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 120,192 148,383
Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 83,896 111,924
Total Commercial [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 402,007 386,972
Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 362,863 332,725
Residential Mortgages [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,950,154 4,016,917
Residential Mortgages [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,898,892 3,969,931
Residential Mortgages [Member] | Nonperforming [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 51,262 46,986
Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,328,039 1,340,178
Consumer [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,316,307 1,329,475
Consumer [Member] | Nonperforming [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 11,732 10,703
Residential Mortgage and Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 5,278,193 5,357,095
Residential Mortgage and Consumer [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 5,215,199 5,299,406
Residential Mortgage and Consumer [Member] | Nonperforming [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 62,994 57,689
Commercial Non-Real Estate [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 9,710,891 9,809,011
Commercial Non-Real Estate [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 9,122,647 9,180,624
Commercial Non-Real Estate [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 227,071 266,120
Commercial Non-Real Estate [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 68,294 88,729
Commercial Non-Real Estate [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 292,879 273,538
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 9,710,891 9,809,011
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 9,122,647 9,180,624
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 227,071 266,120
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 68,294 88,729
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 292,879 273,538
Commercial Real Estate - Owner Occupied [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,299,867 3,270,080
Commercial Real Estate - Owner Occupied [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,116,895 3,064,325
Commercial Real Estate - Owner Occupied [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 97,386 123,373
Commercial Real Estate - Owner Occupied [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 15,602 23,195
Commercial Real Estate - Owner Occupied [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 69,984 59,187
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,299,867 3,270,080
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,116,895 3,064,325
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 97,386 123,373
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 15,602 23,195
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 69,984 59,187
Commercial Real Estate - Income Producing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,382,665 4,283,168
Commercial Real Estate - Income Producing [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,127,601 4,035,415
Commercial Real Estate - Income Producing [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 210,336 189,994
Commercial Real Estate - Income Producing [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 8,240 8,251
Commercial Real Estate - Income Producing [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 36,488 49,508
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,382,665 4,283,168
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,127,601 4,035,415
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 210,336 189,994
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 8,240 8,251
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 36,488 49,508
Construction and Land Development [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,320,224 1,239,086
Construction and Land Development [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,273,603 1,170,834
Construction and Land Development [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 15,909 35,305
Construction and Land Development [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 28,056 28,208
Construction and Land Development [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 2,656 4,739
Construction and Land Development [Member] | Total Commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,320,224 1,239,086
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,273,603 1,170,834
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 15,909 35,305
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 28,056 28,208
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans $ 2,656 $ 4,739