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Loans and Allowance for Credit Losses (Allowance for Credit Losses by Portfolio Class) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses: Beginning balance |  |  | $ 318,882 | $ 307,907
Allowance for loan losses: Net provision for loan losses | $ 14,925 | $ 8,723 | 25,387 | 21,691
Allowance for loan losses: Ending balance | 313,189 | 316,148 | 313,189 | 316,148
Reserve for unfunded lending commitments: Beginning balance |  |  | 24,053 | 28,894
Reserve for unfunded lending commitments: Provision for losses |  |  | 3,047 | (2,815)
Reserve for unfunded lending commitments: Ending balance | 27,100 | 26,079 | 27,100 | 26,079
Total allowance for credit losses | 340,289 | 342,227 | 340,289 | 342,227
Allowance for credit losses: Individually evaluated | 10,618 | 530 | 10,618 | 530
Allowance for credit losses: Collectively evaluated | 329,671 | 341,697 | 329,671 | 341,697
Non-Purchased Credit Impaired Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (35,621) | (35,317)
Allowance for loan losses: Recoveries |  |  | 7,588 | 19,052
Allowance for loan losses: Net provision for loan losses |  |  | 22,340 | 24,506
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
Allowance for loan losses: Ending balance | 65,335 | 77,643 | 65,335 | 77,643
Reserve for unfunded lending commitments: Beginning balance |  |  | 642 | 1,344
Reserve for unfunded lending commitments: Provision for losses |  |  | (152) | (376)
Reserve for unfunded lending commitments: Ending balance | 490 | 968 | 490 | 968
Total allowance for credit losses | 65,825 | 78,611 | 65,825 | 78,611
Allowance for credit losses: Collectively evaluated | 65,825 | 78,611 | 65,825 | 78,611
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
Allowance for loan losses: Ending balance | 17,685 | 27,271 | 17,685 | 27,271
Reserve for unfunded lending commitments: Beginning balance |  |  | 14,639 | 20,019
Reserve for unfunded lending commitments: Provision for losses |  |  | 1,483 | (2,693)
Reserve for unfunded lending commitments: Ending balance | 16,122 | 17,326 | 16,122 | 17,326
Total allowance for credit losses | 33,807 | 44,597 | 33,807 | 44,597
Allowance for credit losses: Collectively evaluated | 33,807 | 44,597 | 33,807 | 44,597
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) | (8,819)
Allowance for loan losses: Recoveries |  |  |  | 5
Allowance for loan losses: Net provision for loan losses |  |  | (6,606) | 11,918
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 |  |  | (33) | (225)
Allowance for loan losses: Recoveries |  |  | 123 | 62
Allowance for loan losses: Net provision for loan losses |  |  | (3,563) | 395
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
Allowance for loan losses: Ending balance | 160,314 | 144,438 | 160,314 | 144,438
Reserve for unfunded lending commitments: Beginning balance |  |  | 6,750 | 5,834
Reserve for unfunded lending commitments: Provision for losses |  |  | 1,996 | 336
Reserve for unfunded lending commitments: Ending balance | 8,746 | 6,170 | 8,746 | 6,170
Total allowance for credit losses | 169,060 | 150,608 | 169,060 | 150,608
Allowance for credit losses: Individually evaluated | 9,667 | 530 | 9,667 | 530
Allowance for credit losses: Collectively evaluated | 159,393 | 150,078 | 159,393 | 150,078
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
Allowance for loan losses: Ending balance | 122,601 | 105,873 | 122,601 | 105,873
Reserve for unfunded lending commitments: Beginning balance |  |  | 6,441 | 5,507
Reserve for unfunded lending commitments: Provision for losses |  |  | 1,963 | 355
Reserve for unfunded lending commitments: Ending balance | 8,404 | 5,862 | 8,404 | 5,862
Total allowance for credit losses | 131,005 | 111,735 | 131,005 | 111,735
Allowance for credit losses: Individually evaluated | 9,626 | 474 | 9,626 | 474
Allowance for credit losses: Collectively evaluated | 121,379 | 111,261 | 121,379 | 111,261
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
Allowance for loan losses: Ending balance | 37,713 | 38,565 | 37,713 | 38,565
Reserve for unfunded lending commitments: Beginning balance |  |  | 309 | 327
Reserve for unfunded lending commitments: Provision for losses |  |  | 33 | (19)
Reserve for unfunded lending commitments: Ending balance | 342 | 308 | 342 | 308
Total allowance for credit losses | 38,055 | 38,873 | 38,055 | 38,873
Allowance for credit losses: Individually evaluated | 41 | 56 | 41 | 56
Allowance for credit losses: Collectively evaluated | 38,014 | 38,817 | 38,014 | 38,817
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 |  |  | (27,225) | (17,304)
Allowance for loan losses: Recoveries |  |  | 5,405 | 16,915
Allowance for loan losses: Net provision for loan losses |  |  | 24,780 | 2,893
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 |  |  | (24,484) | (17,304)
Allowance for loan losses: Recoveries |  |  | 5,042 | 16,054
Allowance for loan losses: Net provision for loan losses |  |  | 20,953 | 5,386
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 |  |  | (2,741) |
Allowance for loan losses: Recoveries |  |  | 363 | 861
Allowance for loan losses: Net provision for loan losses |  |  | 3,827 | (2,493)
Residential Mortgages [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 42,445 | 38,983
Allowance for loan losses: Ending balance | 43,617 | 41,693 | 43,617 | 41,693
Reserve for unfunded lending commitments: Beginning balance |  |  | 4 | 30
Reserve for unfunded lending commitments: Provision for losses |  |  | (3) | (19)
Reserve for unfunded lending commitments: Ending balance | 1 | 11 | 1 | 11
Total allowance for credit losses | 43,618 | 41,704 | 43,618 | 41,704
Allowance for credit losses: Individually evaluated | 753 |  | 753 |
Allowance for credit losses: Collectively evaluated | 42,865 | 41,704 | 42,865 | 41,704
Residential Mortgages [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (429) | (67)
Allowance for loan losses: Recoveries |  |  | 453 | 296
Allowance for loan losses: Net provision for loan losses |  |  | 1,148 | 2,481
Consumer [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 25,950 | 25,412
Allowance for loan losses: Ending balance | 26,238 | 25,103 | 26,238 | 25,103
Reserve for unfunded lending commitments: Beginning balance |  |  | 2,018 | 1,667
Reserve for unfunded lending commitments: Provision for losses |  |  | (277) | (63)
Reserve for unfunded lending commitments: Ending balance | 1,741 | 1,604 | 1,741 | 1,604
Total allowance for credit losses | 27,979 | 26,707 | 27,979 | 26,707
Allowance for credit losses: Individually evaluated | 198 |  | 198 |
Allowance for credit losses: Collectively evaluated | $ 27,781 | $ 26,707 | 27,781 | 26,707
Consumer [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (7,900) | (8,902)
Allowance for loan losses: Recoveries |  |  | 1,607 | 1,774
Allowance for loan losses: Net provision for loan losses |  |  | $ 6,581 | $ 6,819

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