v3.26.1
Loans and Allowance for Credit Losses (Aging Analysis of Past Due Loans by Portfolio Class) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans $ 24,580,173 $ 23,958,440
Recorded Investment > 90 Days and Still Accruing 27,753 28,798
30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 57,848 88,351
60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 46,673 69,653
90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 108,395 102,723
Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 212,916 260,727
Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 24,367,257 23,697,713
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 4,602,813 4,283,168
Recorded Investment > 90 Days and Still Accruing 10,585 2,928
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 5,210 990
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 3,360 2,806
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | 90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 12,439 7,177
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 21,009 10,973
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 4,581,804 4,272,195
Total Commercial [Member] | Construction and Land Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 1,405,454 1,239,086
Recorded Investment > 90 Days and Still Accruing 60 565
Total Commercial [Member] | Construction and Land Development [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 91 1,754
Total Commercial [Member] | Construction and Land Development [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 141 564
Total Commercial [Member] | Construction and Land Development [Member] | 90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 1,015 3,488
Total Commercial [Member] | Construction and Land Development [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 1,247 5,806
Total Commercial [Member] | Construction and Land Development [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 1,404,207 1,233,280
Total Commercial [Member] | Total Commercial And Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 13,314,959 13,079,091
Recorded Investment > 90 Days and Still Accruing 15,135 21,944
Total Commercial [Member] | Total Commercial And Industrial [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 32,258 34,021
Total Commercial [Member] | Total Commercial And Industrial [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 25,048 43,624
Total Commercial [Member] | Total Commercial And Industrial [Member] | 90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 45,374 47,563
Total Commercial [Member] | Total Commercial And Industrial [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 102,680 125,208
Total Commercial [Member] | Total Commercial And Industrial [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 13,212,279 12,953,883
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 9,961,458 9,809,011
Recorded Investment > 90 Days and Still Accruing 11,846 20,358
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 22,170 19,008
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 20,938 43,316
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | 90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 36,190 39,954
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 79,298 102,278
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 9,882,160 9,706,733
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 3,353,501 3,270,080
Recorded Investment > 90 Days and Still Accruing 3,289 1,586
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 10,088 15,013
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 4,110 308
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | 90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 9,184 7,609
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 23,382 22,930
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 3,330,119 3,247,150
Residential Mortgages [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 3,909,076 4,016,917
Recorded Investment > 90 Days and Still Accruing 83 116
Residential Mortgages [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 12,771 42,302
Residential Mortgages [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 15,533 17,984
Residential Mortgages [Member] | 90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 40,094 34,656
Residential Mortgages [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 68,398 94,942
Residential Mortgages [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 3,840,678 3,921,975
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 1,347,871 1,340,178
Recorded Investment > 90 Days and Still Accruing 1,890 3,245
Consumer [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 7,518 9,284
Consumer [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 2,591 4,675
Consumer [Member] | 90 Days or More Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 9,473 9,839
Consumer [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 19,582 23,798
Consumer [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans $ 1,328,289 $ 1,316,380