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Loans and Allowance for Credit Losses (Credit Quality Indicators by Segment and Portfolio Class) (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Total Commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans $ 18,601,345 $ 17,968,274
Total Commercial [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 13,079,091 12,888,547
Total Commercial [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 17,451,198 16,823,845
Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 12,244,949 11,990,460
Total Commercial [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 614,792 521,400
Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 389,493 355,541
Total Commercial [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 148,383 190,898
Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 111,924 167,606
Total Commercial [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 386,972 432,131
Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 332,725 374,940
Residential Mortgages [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,016,917 3,961,328
Residential Mortgages [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,969,931 3,917,242
Residential Mortgages [Member] | Nonperforming [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 46,986 44,086
Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,340,178 1,369,845
Consumer [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,329,475 1,358,658
Consumer [Member] | Nonperforming [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 10,703 11,187
Residential Mortgage and Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 5,357,095 5,331,173
Residential Mortgage and Consumer [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 5,299,406 5,275,900
Residential Mortgage and Consumer [Member] | Nonperforming [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 57,689 55,273
Commercial Non-Real Estate [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 9,809,011 9,876,592
Commercial Non-Real Estate [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 9,180,624 9,157,232
Commercial Non-Real Estate [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 266,120 219,975
Commercial Non-Real Estate [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 88,729 149,705
Commercial Non-Real Estate [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 273,538 349,680
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 9,809,011 9,876,592
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 9,180,624 9,157,232
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 266,120 219,975
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 88,729 149,705
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 273,538 349,680
Commercial Real Estate - Owner Occupied [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,270,080 3,011,955
Commercial Real Estate - Owner Occupied [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,064,325 2,833,228
Commercial Real Estate - Owner Occupied [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 123,373 135,566
Commercial Real Estate - Owner Occupied [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 23,195 17,901
Commercial Real Estate - Owner Occupied [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 59,187 25,260
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,270,080 3,011,955
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,064,325 2,833,228
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 123,373 135,566
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 23,195 17,901
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 59,187 25,260
Commercial Real Estate - Income Producing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,283,168 3,798,612
Commercial Real Estate - Income Producing [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,035,415 3,625,981
Commercial Real Estate - Income Producing [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 189,994 99,638
Commercial Real Estate - Income Producing [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 8,251 22,278
Commercial Real Estate - Income Producing [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 49,508 50,715
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,283,168 3,798,612
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,035,415 3,625,981
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 189,994 99,638
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 8,251 22,278
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 49,508 50,715
Construction and Land Development [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,239,086 1,281,115
Construction and Land Development [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,170,834 1,207,404
Construction and Land Development [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 35,305 66,221
Construction and Land Development [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 28,208 1,014
Construction and Land Development [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,739 6,476
Construction and Land Development [Member] | Total Commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,239,086 1,281,115
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,170,834 1,207,404
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 35,305 66,221
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 28,208 1,014
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans $ 4,739 $ 6,476