v3.26.1
Loans and Allowance for Credit Losses (Credit Quality Indicators by Segment and Portfolio Class) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Total Commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans $ 19,323,226 $ 18,601,345
Total Commercial [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 13,314,959 13,079,091
Total Commercial [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 18,374,008 17,451,198
Total Commercial [Member] | Pass [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 12,585,680 12,244,949
Total Commercial [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 457,233 614,792
Total Commercial [Member] | Pass-Watch [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 291,765 389,493
Total Commercial [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 88,693 148,383
Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 84,777 111,924
Total Commercial [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 403,292 386,972
Total Commercial [Member] | Substandard [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 352,737 332,725
Residential Mortgages [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,909,076 4,016,917
Residential Mortgages [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,857,568 3,969,931
Residential Mortgages [Member] | Nonperforming [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 51,508 46,986
Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,347,871 1,340,178
Consumer [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,336,321 1,329,475
Consumer [Member] | Nonperforming [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 11,550 10,703
Residential Mortgage and Consumer [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 5,256,947 5,357,095
Residential Mortgage and Consumer [Member] | Performing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 5,193,889 5,299,406
Residential Mortgage and Consumer [Member] | Nonperforming [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 63,058 57,689
Commercial Non-Real Estate [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 9,961,458 9,809,011
Commercial Non-Real Estate [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 9,391,177 9,180,624
Commercial Non-Real Estate [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 225,042 266,120
Commercial Non-Real Estate [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 66,283 88,729
Commercial Non-Real Estate [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 278,956 273,538
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 9,961,458 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 9,391,177 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 225,042 266,120
Commercial Non-Real Estate [Member] | Total Commercial [Member] | Special Mention [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 66,283 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 278,956 273,538
Commercial Real Estate - Owner Occupied [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,353,501 3,270,080
Commercial Real Estate - Owner Occupied [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,194,503 3,064,325
Commercial Real Estate - Owner Occupied [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 66,723 123,373
Commercial Real Estate - Owner Occupied [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 18,494 23,195
Commercial Real Estate - Owner Occupied [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 73,781 59,187
Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] | Total Commercial And Industrial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,353,501 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 3,194,503 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 66,723 123,373
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 18,494 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 73,781 59,187
Commercial Real Estate - Income Producing [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,602,813 4,283,168
Commercial Real Estate - Income Producing [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,427,579 4,035,415
Commercial Real Estate - Income Producing [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 154,052 189,994
Commercial Real Estate - Income Producing [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,916 8,251
Commercial Real Estate - Income Producing [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 17,266 49,508
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,602,813 4,283,168
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 4,427,579 4,035,415
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 154,052 189,994
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 3,916 8,251
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 17,266 49,508
Construction and Land Development [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,405,454 1,239,086
Construction and Land Development [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,360,749 1,170,834
Construction and Land Development [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 11,416 35,305
Construction and Land Development [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans   28,208
Construction and Land Development [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 33,289 4,739
Construction and Land Development [Member] | Total Commercial [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,405,454 1,239,086
Construction and Land Development [Member] | Total Commercial [Member] | Pass [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 1,360,749 1,170,834
Construction and Land Development [Member] | Total Commercial [Member] | Pass-Watch [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans 11,416 35,305
Construction and Land Development [Member] | Total Commercial [Member] | Special Mention [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans   28,208
Construction and Land Development [Member] | Total Commercial [Member] | Substandard [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans $ 33,289 $ 4,739