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Loans and Allowance for Credit Losses (Aging Analysis of Past Due Loans by Portfolio Class) (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans $ 23,098,146 $ 23,299,447
Recorded Investment > 90 Days and Still Accruing 15,593 21,852
30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 132,111 74,706
60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 35,827 44,923
Greater Than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 70,600 79,898
Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 238,538 199,527
Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 22,859,608 23,099,920
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 3,809,664 3,798,612
Recorded Investment > 90 Days and Still Accruing 359 150
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 18,638 220
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   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 6,113 464
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 24,751 6,101
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 3,784,913 3,792,511
Total Commercial [Member] | Construction and Land Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 1,287,919 1,281,115
Recorded Investment > 90 Days and Still Accruing 3,347 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 760 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 626 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 4,727 5,314
Total Commercial [Member] | Construction and Land Development [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 6,113 10,153
Total Commercial [Member] | Construction and Land Development [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 1,281,806 1,270,962
Total Commercial [Member] | Total Commercial And Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 12,637,592 12,888,547
Recorded Investment > 90 Days and Still Accruing 10,111 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 51,377 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 18,434 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 27,943 31,503
Total Commercial [Member] | Total Commercial And Industrial [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 97,754 57,244
Total Commercial [Member] | Total Commercial And Industrial [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 12,539,838 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 9,636,594 9,876,592
Recorded Investment > 90 Days and Still Accruing 9,095 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 18,064 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 6,544 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 23,169 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 47,777 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 9,588,817 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 3,000,998 3,011,955
Recorded Investment > 90 Days and Still Accruing 1,016 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 33,313 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 11,890 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 4,774 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 49,977 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 2,951,021 3,007,057
Residential Mortgages [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 4,025,145 3,961,328
Recorded Investment > 90 Days and Still Accruing 53 27
Residential Mortgages [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 51,599 42,211
Residential Mortgages [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 11,574 25,050
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 23,522 34,113
Residential Mortgages [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 86,695 101,374
Residential Mortgages [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 3,938,450 3,859,954
Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 1,337,826 1,369,845
Recorded Investment > 90 Days and Still Accruing 1,723 2,458
Consumer [Member] | 30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 9,737 10,770
Consumer [Member] | 60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 5,193 5,381
Consumer [Member] | Greater Than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 8,295 8,504
Consumer [Member] | Total Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans 23,225 24,655
Consumer [Member] | Current [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Total loans $ 1,314,601 $ 1,345,190