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Loans and Allowance for Credit Losses (Credit Quality Indicators by Segment and Portfolio Class) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Total Commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans $ 18,233,803 $ 17,968,274
Total Commercial [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 12,959,855 12,888,547
Total Commercial [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 17,088,285 16,823,845
Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 12,068,799 11,990,460
Total Commercial [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 596,340 521,400
Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 433,659 355,541
Total Commercial [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 158,368 190,898
Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 121,690 167,606
Total Commercial [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 390,810 432,131
Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 335,707 374,940
Residential Mortgages [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,027,600 3,961,328
Residential Mortgages [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,986,574 3,917,242
Residential Mortgages [Member] | Nonperforming [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 41,026 44,086
Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,335,162 1,369,845
Consumer [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,324,897 1,358,658
Consumer [Member] | Nonperforming [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 10,265 11,187
Residential Mortgage and Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 5,362,762 5,331,173
Residential Mortgage and Consumer [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 5,311,471 5,275,900
Residential Mortgage and Consumer [Member] | Nonperforming [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 51,291 55,273
Commercial Non-Real Estate [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 9,680,597 9,876,592
Commercial Non-Real Estate [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 8,979,717 9,157,232
Commercial Non-Real Estate [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 302,204 219,975
Commercial Non-Real Estate [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 91,828 149,705
Commercial Non-Real Estate [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 306,848 349,680
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 9,680,597 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 8,979,717 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 302,204 219,975
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 91,828 149,705
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 306,848 349,680
Commercial Real Estate - Owner Occupied [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,279,258 3,011,955
Commercial Real Estate - Owner Occupied [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,089,082 2,833,228
Commercial Real Estate - Owner Occupied [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 131,455 135,566
Commercial Real Estate - Owner Occupied [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 29,862 17,901
Commercial Real Estate - Owner Occupied [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 28,859 25,260
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,279,258 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 3,089,082 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 131,455 135,566
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 29,862 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 28,859 25,260
Commercial Real Estate - Income Producing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,076,643 3,798,612
Commercial Real Estate - Income Producing [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,888,691 3,625,981
Commercial Real Estate - Income Producing [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 129,411 99,638
Commercial Real Estate - Income Producing [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 8,308 22,278
Commercial Real Estate - Income Producing [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 50,233 50,715
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,076,643 3,798,612
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,888,691 3,625,981
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 129,411 99,638
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 8,308 22,278
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 50,233 50,715
Construction and Land Development [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,197,305 1,281,115
Construction and Land Development [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,130,795 1,207,404
Construction and Land Development [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 33,270 66,221
Construction and Land Development [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 28,370 1,014
Construction and Land Development [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,870 6,476
Construction and Land Development [Member] | Total Commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,197,305 1,281,115
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,130,795 1,207,404
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 33,270 66,221
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 28,370 1,014
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans $ 4,870 $ 6,476