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Loans and Allowance for Credit Losses (Allowance for Credit Losses by Portfolio Class) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses: Beginning balance |  |  | $ 318,882 | $ 307,907
Allowance for loan losses: provision for loan losses | $ 12,651 | $ 18,564 | 38,038 | 40,255
Allowance for loan losses: Ending balance | 313,636 | 317,271 | 313,636 | 317,271
Reserve for unfunded lending commitments: Beginning balance |  |  | 24,053 | 28,894
Reserve for unfunded lending commitments: Provision for losses |  |  | 3,821 | (3,401)
Reserve for unfunded lending commitments: Ending balance | 27,874 | 25,493 | 27,874 | 25,493
Total allowance for credit losses | 341,510 | 342,764 | 341,510 | 342,764
Allowance for credit losses: Individually evaluated | 12,769 | 5,994 | 12,769 | 5,994
Allowance for credit losses: Collectively evaluated | 328,741 | 336,770 | 328,741 | 336,770
Non-Purchased Credit Impaired Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (51,357) | (56,430)
Allowance for loan losses: Recoveries |  |  | 11,894 | 22,138
Allowance for loan losses: provision for loan losses |  |  | 34,217 | 43,656
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 | 62,155 | 78,467 | 62,155 | 78,467
Reserve for unfunded lending commitments: Beginning balance |  |  | 642 | 1,344
Reserve for unfunded lending commitments: Provision for losses |  |  | 3 | (353)
Reserve for unfunded lending commitments: Ending balance | 645 | 991 | 645 | 991
Total allowance for credit losses | 62,800 | 79,458 | 62,800 | 79,458
Allowance for credit losses: Collectively evaluated | 62,800 | 79,458 | 62,800 | 79,458
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 | 17,211 | 24,793 | 17,211 | 24,793
Reserve for unfunded lending commitments: Beginning balance |  |  | 14,639 | 20,019
Reserve for unfunded lending commitments: Provision for losses |  |  | 168 | (4,250)
Reserve for unfunded lending commitments: Ending balance | 14,807 | 15,769 | 14,807 | 15,769
Total allowance for credit losses | 32,018 | 40,562 | 32,018 | 40,562
Allowance for credit losses: Collectively evaluated | 32,018 | 40,562 | 32,018 | 40,562
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 |  |  |  | 7
Allowance for loan losses: provision for loan losses |  |  | (9,798) | 12,740
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 |  |  | (1,291) | (264)
Allowance for loan losses: Recoveries |  |  | 123 | 62
Allowance for loan losses: provision for loan losses |  |  | (2,779) | (2,044)
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 | 165,890 | 146,283 | 165,890 | 146,283
Reserve for unfunded lending commitments: Beginning balance |  |  | 6,750 | 5,834
Reserve for unfunded lending commitments: Provision for losses |  |  | 3,784 | 709
Reserve for unfunded lending commitments: Ending balance | 10,534 | 6,543 | 10,534 | 6,543
Total allowance for credit losses | 176,424 | 152,826 | 176,424 | 152,826
Allowance for credit losses: Individually evaluated | 11,735 | 5,047 | 11,735 | 5,047
Allowance for credit losses: Collectively evaluated | 164,689 | 147,779 | 164,689 | 147,779
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 | 125,854 | 108,743 | 125,854 | 108,743
Reserve for unfunded lending commitments: Beginning balance |  |  | 6,441 | 5,507
Reserve for unfunded lending commitments: Provision for losses |  |  | 3,785 | 752
Reserve for unfunded lending commitments: Ending balance | 10,226 | 6,259 | 10,226 | 6,259
Total allowance for credit losses | 136,080 | 115,002 | 136,080 | 115,002
Allowance for credit losses: Individually evaluated | 11,131 | 4,996 | 11,131 | 4,996
Allowance for credit losses: Collectively evaluated | 124,949 | 110,006 | 124,949 | 110,006
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 | 40,036 | 37,540 | 40,036 | 37,540
Reserve for unfunded lending commitments: Beginning balance |  |  | 309 | 327
Reserve for unfunded lending commitments: Provision for losses |  |  | (1) | (43)
Reserve for unfunded lending commitments: Ending balance | 308 | 284 | 308 | 284
Total allowance for credit losses | 40,344 | 37,824 | 40,344 | 37,824
Allowance for credit losses: Individually evaluated | 604 | 51 | 604 | 51
Allowance for credit losses: Collectively evaluated | 39,740 | 37,773 | 39,740 | 37,773
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 |  |  | (37,071) | (33,869)
Allowance for loan losses: Recoveries |  |  | 9,025 | 19,053
Allowance for loan losses: provision for loan losses |  |  | 36,582 | 19,165
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 |  |  | (32,445) | (33,869)
Allowance for loan losses: Recoveries |  |  | 8,484 | 18,067
Allowance for loan losses: provision for loan losses |  |  | 28,725 | 22,808
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) |
Allowance for loan losses: Recoveries |  |  | 541 | 986
Allowance for loan losses: provision for loan losses |  |  | 7,857 | (3,643)
Total Commercial [Member] | Total Commercial And Industrial [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: Recoveries |  |  | 12 |
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 | 42,631 | 42,857 | 42,631 | 42,857
Reserve for unfunded lending commitments: Beginning balance |  |  | 4 | 30
Reserve for unfunded lending commitments: Provision for losses |  |  | (3) | (27)
Reserve for unfunded lending commitments: Ending balance | 1 | 3 | 1 | 3
Total allowance for credit losses | 42,632 | 42,860 | 42,632 | 42,860
Allowance for credit losses: Individually evaluated | 841 | 750 | 841 | 750
Allowance for credit losses: Collectively evaluated | 41,791 | 42,110 | 41,791 | 42,110
Residential Mortgages [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (678) | (229)
Allowance for loan losses: Recoveries |  |  | 521 | 430
Allowance for loan losses: provision for loan losses |  |  | 343 | 3,673
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 | 25,749 | 24,871 | 25,749 | 24,871
Reserve for unfunded lending commitments: Beginning balance |  |  | 2,018 | 1,667
Reserve for unfunded lending commitments: Provision for losses |  |  | (131) | 520
Reserve for unfunded lending commitments: Ending balance | 1,887 | 2,187 | 1,887 | 2,187
Total allowance for credit losses | 27,636 | 27,058 | 27,636 | 27,058
Allowance for credit losses: Individually evaluated | 193 | 197 | 193 | 197
Allowance for credit losses: Collectively evaluated | $ 27,443 | $ 26,861 | 27,443 | 26,861
Consumer [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (12,283) | (13,249)
Allowance for loan losses: Recoveries |  |  | 2,213 | 2,586
Allowance for loan losses: provision for loan losses |  |  | $ 9,869 | $ 10,122

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