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Loans and Allowance for Credit Losses (Aging Analysis of Past Due Loans by Portfolio Class) (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans $ 23,596,565 $ 23,299,447
Recorded Investment > 90 Days and Still Accruing 24,576 21,852
30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 34,239 74,706
60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 37,515 44,923
Greater Than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 100,053 79,898
Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 171,807 199,527
Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 23,424,758 23,099,920
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 4,076,643 3,798,612
Recorded Investment > 90 Days and Still Accruing 0 150
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 3,092 220
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 149 5,417
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 4,226 464
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 7,467 6,101
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 4,069,176 3,792,511
Total Commercial [Member] | Construction and Land Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 1,197,305 1,281,115
Recorded Investment > 90 Days and Still Accruing 147 3,563
Total Commercial [Member] | Construction and Land Development [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 1,096 1,066
Total Commercial [Member] | Construction and Land Development [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 627 3,773
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 3,082 5,314
Total Commercial [Member] | Construction and Land Development [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 4,805 10,153
Total Commercial [Member] | Construction and Land Development [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 1,192,500 1,270,962
Total Commercial [Member] | Total Commercial And Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 12,959,855 12,888,547
Recorded Investment > 90 Days and Still Accruing 21,480 15,654
Total Commercial [Member] | Total Commercial And Industrial [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 7,316 20,439
Total Commercial [Member] | Total Commercial And Industrial [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 14,283 5,302
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 53,052 31,503
Total Commercial [Member] | Total Commercial And Industrial [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 74,651 57,244
Total Commercial [Member] | Total Commercial And Industrial [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 12,885,204 12,831,303
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 9,680,597 9,876,592
Recorded Investment > 90 Days and Still Accruing 20,134 14,557
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 5,222 19,326
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 12,940 5,264
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 45,260 27,756
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 63,422 52,346
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 9,617,175 9,824,246
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 3,279,258 3,011,955
Recorded Investment > 90 Days and Still Accruing 1,346 1,097
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 2,094 1,113
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 1,343 38
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 7,792 3,747
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 11,229 4,898
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 3,268,029 3,007,057
Residential Mortgages [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 4,027,600 3,961,328
Recorded Investment > 90 Days and Still Accruing 7 27
Residential Mortgages [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 14,335 42,211
Residential Mortgages [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 18,898 25,050
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 30,275 34,113
Residential Mortgages [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 63,508 101,374
Residential Mortgages [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 3,964,092 3,859,954
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 1,335,162 1,369,845
Recorded Investment > 90 Days and Still Accruing 2,942 2,458
Consumer [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 8,400 10,770
Consumer [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 3,558 5,381
Consumer [Member] | Greater Than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 9,418 8,504
Consumer [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 21,376 24,655
Consumer [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans $ 1,313,786 $ 1,345,190