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Loans and Allowance for Credit Losses (Allowance for Credit Losses by Portfolio Class) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses: Beginning balance $ 307,731 $ 318,882
Allowance for loan losses: Net provision for loan losses 13,172 10,462
Allowance for loan losses: Ending balance 311,316 318,119
Reserve for unfunded lending commitments: Beginning balance 33,928 24,053
Reserve for unfunded lending commitments: Provision for losses 1,549 (978)
Reserve for unfunded lending commitments: Ending balance 32,379 25,031
Total allowance for credit losses 343,695 343,150
Allowance for credit losses: Individually evaluated 11,233 11,404
Allowance for credit losses: Collectively evaluated 332,462 331,746
Non-Purchased Credit Impaired Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses: Charge-offs (13,393) (13,293)
Allowance for loan losses: Recoveries 2,257 3,046
Allowance for loan losses: Net provision for loan losses 14,721 9,484
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses: Beginning balance 60,475 71,975
Allowance for loan losses: Ending balance 57,115 70,379
Reserve for unfunded lending commitments: Beginning balance 1,005 642
Reserve for unfunded lending commitments: Provision for losses 183 (198)
Reserve for unfunded lending commitments: Ending balance 822 444
Total allowance for credit losses 57,937 70,823
Allowance for credit losses: Collectively evaluated 57,937 70,823
Total Commercial [Member] | Construction and Land Development [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses: Beginning balance 17,450 21,158
Allowance for loan losses: Ending balance 17,710 20,208
Reserve for unfunded lending commitments: Beginning balance 17,949 14,639
Reserve for unfunded lending commitments: Provision for losses 86 (696)
Reserve for unfunded lending commitments: Ending balance 18,035 15,335
Total allowance for credit losses 35,745 35,543
Allowance for credit losses: Collectively evaluated 35,745 35,543
Total Commercial [Member] | Non-Purchased Credit Impaired Loans [Member] | Commercial Real Estate - Income Producing [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses: Charge-offs 0 (34)
Allowance for loan losses: Recoveries 3 0
Allowance for loan losses: Net provision for loan losses (3,363) 1,562
Total Commercial [Member] | Non-Purchased Credit Impaired Loans [Member] | Construction and Land Development [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses: Charge-offs (219) (8)
Allowance for loan losses: Recoveries 1 110
Allowance for loan losses: Net provision for loan losses (478) (1,052)
Total Commercial [Member] | Total Commercial And Industrial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses: Beginning balance 162,134 157,354
Allowance for loan losses: Ending balance 171,219 158,348
Reserve for unfunded lending commitments: Beginning balance 13,010 6,750
Reserve for unfunded lending commitments: Provision for losses 1,340 502
Reserve for unfunded lending commitments: Ending balance 11,670 7,252
Total allowance for credit losses 182,889 165,600
Allowance for credit losses: Individually evaluated 10,947 10,455
Allowance for credit losses: Collectively evaluated 171,942 155,145
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses: Beginning balance 121,439 121,090
Allowance for loan losses: Net provision for loan losses 13,433  
Allowance for loan losses: Ending balance 127,489 122,215
Reserve for unfunded lending commitments: Beginning balance 12,639 6,441
Reserve for unfunded lending commitments: Provision for losses (1,292) 515
Reserve for unfunded lending commitments: Ending balance 11,347 6,956
Total allowance for credit losses 138,836 129,171
Allowance for credit losses: Individually evaluated 10,947 10,406
Allowance for credit losses: Collectively evaluated 127,889 118,765
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses: Beginning balance 40,695 36,264
Allowance for loan losses: Ending balance 43,730 36,133
Reserve for unfunded lending commitments: Beginning balance 371 309
Reserve for unfunded lending commitments: Provision for losses (48) (13)
Reserve for unfunded lending commitments: Ending balance 323 296
Total allowance for credit losses 44,053 36,429
Allowance for credit losses: Individually evaluated   49
Allowance for credit losses: Collectively evaluated 44,053 36,380
Total Commercial [Member] | Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses: Charge-offs (8,514) (8,873)
Allowance for loan losses: Recoveries 1,265 1,745
Allowance for loan losses: Net provision for loan losses 16,334 8,122
Total Commercial [Member] | Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Commercial Non-Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses: Charge-offs (8,506) (6,132)
Allowance for loan losses: Recoveries 1,123 1,650
Allowance for loan losses: Net provision for loan losses   5,607
Total Commercial [Member] | Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Commercial Real Estate - Owner Occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses: Charge-offs (8)  
Allowance for loan losses: Recoveries 142 95
Allowance for loan losses: Net provision for loan losses 2,901 (2,515)
Residential Mortgages [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses: Beginning balance 42,834 42,445
Allowance for loan losses: Ending balance 41,566 43,200
Reserve for unfunded lending commitments: Beginning balance 3 4
Reserve for unfunded lending commitments: Provision for losses (2) (1)
Reserve for unfunded lending commitments: Ending balance 1 3
Total allowance for credit losses 41,567 43,203
Allowance for credit losses: Individually evaluated 234 752
Allowance for credit losses: Collectively evaluated 41,333 42,451
Residential Mortgages [Member] | Non-Purchased Credit Impaired Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses: Charge-offs (250) (167)
Allowance for loan losses: Recoveries 71 387
Allowance for loan losses: Net provision for loan losses 1,089 535
Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses: Beginning balance 24,838 25,950
Allowance for loan losses: Ending balance 23,706 25,984
Reserve for unfunded lending commitments: Beginning balance 1,961 2,018
Reserve for unfunded lending commitments: Provision for losses (110) 21
Reserve for unfunded lending commitments: Ending balance 1,851 1,997
Total allowance for credit losses 25,557 27,981
Allowance for credit losses: Individually evaluated 52 197
Allowance for credit losses: Collectively evaluated 25,505 27,784
Consumer [Member] | Non-Purchased Credit Impaired Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses: Charge-offs (4,410) (4,211)
Allowance for loan losses: Recoveries 917 804
Allowance for loan losses: Net provision for loan losses $ 2,361 $ 3,441