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Loans and Allowance for Credit Losses (Allowance for Credit Losses by Portfolio Class) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses: Beginning balance $ 318,882 $ 307,907 $ 307,789
Allowance for loan losses: Net provision for loan losses 51,183 52,167 59,103
Allowance for loan losses: Ending balance 307,731 318,882 307,907
Reserve for unfunded lending commitments: Beginning balance 24,053 28,894 33,309
Reserve for unfunded lending commitments: Provision for losses (9,875) (4,841) (4,415)
Reserve for unfunded lending commitments: Ending balance 33,928 24,053 28,894
Total allowance for credit losses 341,659 342,935 336,801
Allowance for credit losses: Individually evaluated 7,398 9,620 1,666
Allowance for credit losses: Collectively evaluated 334,261 333,315 335,135
Non-Purchased Credit Impaired Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses: Charge-offs (68,466) (73,084) (75,423)
Allowance for loan losses: Recoveries 16,007 27,051 12,023
Allowance for loan losses: Net provision for loan losses 41,308 57,008 (63,518)
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses: Beginning balance 71,975 74,539 71,961
Allowance for loan losses: Ending balance 60,475 71,975 74,539
Reserve for unfunded lending commitments: Beginning balance 642 1,344 1,395
Reserve for unfunded lending commitments: Provision for losses (363) (702) (51)
Reserve for unfunded lending commitments: Ending balance 1,005 642 1,344
Total allowance for credit losses 61,480 72,617 75,883
Allowance for credit losses: Individually evaluated     0
Allowance for credit losses: Collectively evaluated 61,480 72,617 75,883
Total Commercial [Member] | Construction and Land Development [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses: Beginning balance 21,158 27,039 30,498
Allowance for loan losses: Ending balance 17,450 21,158 27,039
Reserve for unfunded lending commitments: Beginning balance 14,639 20,019 25,110
Reserve for unfunded lending commitments: Provision for losses (3,310) (5,380) (5,091)
Reserve for unfunded lending commitments: Ending balance 17,949 14,639 20,019
Total allowance for credit losses 35,399 35,797 47,058
Allowance for credit losses: Individually evaluated     0
Allowance for credit losses: Collectively evaluated 35,399 35,797 47,058
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 (34) (8,822) (73)
Allowance for loan losses: Recoveries 49 7 14
Allowance for loan losses: Net provision for loan losses (11,515) 6,251 2,637
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 (1,314) (264) (72)
Allowance for loan losses: Recoveries 123 64 11
Allowance for loan losses: Net provision for loan losses (2,517) (5,681) (3,398)
Total Commercial [Member] | Total Commercial And Industrial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses: Beginning balance 157,354 141,934 144,745
Allowance for loan losses: Ending balance 162,134 157,354 141,934
Reserve for unfunded lending commitments: Beginning balance 6,750 5,834 5,286
Reserve for unfunded lending commitments: Provision for losses 6,260 916 548
Reserve for unfunded lending commitments: Ending balance 13,010 6,750 5,834
Total allowance for credit losses 175,144 164,104 147,768
Allowance for credit losses: Individually evaluated 7,108 8,672 1,666
Allowance for credit losses: Collectively evaluated 168,036 155,432 146,102
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 121,090 101,737 96,461
Allowance for loan losses: Ending balance 121,439 121,090 101,737
Reserve for unfunded lending commitments: Beginning balance 6,441 5,507 4,984
Reserve for unfunded lending commitments: Provision for losses 6,198 934 523
Reserve for unfunded lending commitments: Ending balance 12,639 6,441 5,507
Total allowance for credit losses 134,078 127,531 107,244
Allowance for credit losses: Individually evaluated 6,506 8,672 1,666
Allowance for credit losses: Collectively evaluated 127,572 118,859 105,578
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 36,264 40,197 48,284
Allowance for loan losses: Ending balance 40,695 36,264 40,197
Reserve for unfunded lending commitments: Beginning balance 309 327 302
Reserve for unfunded lending commitments: Provision for losses (62) (18) (25)
Reserve for unfunded lending commitments: Ending balance 371 309 327
Total allowance for credit losses 41,066 36,573 40,524
Allowance for credit losses: Individually evaluated 602   0
Allowance for credit losses: Collectively evaluated 40,464 36,573 40,524
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 (50,190) (45,631) (59,830)
Allowance for loan losses: Recoveries 12,018 23,328 7,109
Allowance for loan losses: Net provision for loan losses 42,952 37,723 (49,910)
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 (45,564) (45,488) (59,830)
Allowance for loan losses: Recoveries 11,332 22,292 6,152
Allowance for loan losses: Net provision for loan losses 34,581 42,549 (58,954)
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 (4,626) (143) 0
Allowance for loan losses: Recoveries 686 1,036 957
Allowance for loan losses: Net provision for loan losses (8,371) (4,826) (9,044)
Residential Mortgages [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses: Beginning balance 42,445 38,983 32,464
Allowance for loan losses: Ending balance 42,834 42,445 38,983
Reserve for unfunded lending commitments: Beginning balance 4 30 31
Reserve for unfunded lending commitments: Provision for losses (1) (26) 1
Reserve for unfunded lending commitments: Ending balance 3 4 30
Total allowance for credit losses 42,837 42,449 39,013
Allowance for credit losses: Individually evaluated 236   0
Allowance for credit losses: Collectively evaluated 42,601 41,698 39,013
Residential Mortgages [Member] | Non-Purchased Credit Impaired Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses: Charge-offs (922) (380) (55)
Allowance for loan losses: Recoveries 841 595 1,278
Allowance for loan losses: Net provision for loan losses 470 3,247 5,296
Residential Mortgages [Member] | Total Commercial And Industrial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for credit losses: Individually evaluated   751  
Consumer [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses: Beginning balance 25,950 25,412 28,121
Allowance for loan losses: Ending balance 24,838 25,950 25,412
Reserve for unfunded lending commitments: Beginning balance 2,018 1,667 1,487
Reserve for unfunded lending commitments: Provision for losses 57 351 180
Reserve for unfunded lending commitments: Ending balance 1,961 2,018 1,667
Total allowance for credit losses 26,799 27,968 27,079
Allowance for credit losses: Individually evaluated 54   0
Allowance for credit losses: Collectively evaluated 26,745 27,771 27,079
Consumer [Member] | Non-Purchased Credit Impaired Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for loan losses: Charge-offs (16,006) (17,987) (15,393)
Allowance for loan losses: Recoveries 2,976 3,057 3,611
Allowance for loan losses: Net provision for loan losses $ 11,918 15,468 $ 9,073
Consumer [Member] | Total Commercial And Industrial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Allowance for credit losses: Individually evaluated   $ 197