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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 |

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