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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | $ 307,907 | $ 307,789 |
Allowance for loan losses: Net provision for loan losses | $ 18,564 | $ 28,498 | 40,255 | 42,151 |
Allowance for loan losses: Ending balance | 317,271 | 306,291 | 317,271 | 306,291 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 28,894 | 33,309 |
Reserve for unfunded lending commitments: Provision for losses |  |  | (3,401) | (3,696) |
Reserve for unfunded lending commitments: Ending balance | 25,493 | 29,613 | 25,493 | 29,613 |
Total allowance for credit losses | 342,764 | 335,904 | 342,764 | 335,904 |
Allowance for loan losses: Individually evaluated | 5,281 | 0 | 5,281 | 0 |
Allowance for loan losses: Collectively evaluated | 311,990 | 304,625 | 311,990 | 304,625 |
Reserve for unfunded lending commitments: Individually evaluated | 713 | 1,666 | 713 | 1,666 |
Reserve for unfunded lending commitments: Collectively evaluated | 24,780 | 29,613 | 24,780 | 29,613 |
Loans: Individually evaluated for impairment | 26,016 | 17,658 | 26,016 | 17,658 |
Loans: Collectively evaluated for impairment | 23,429,571 | 23,966,021 | 23,429,571 | 23,966,021 |
Total loans | 23,455,587 | 23,983,679 | 23,455,587 | 23,983,679 | $ 23,921,917
Non-Purchased Credit Impaired Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (56,430) | (55,822) |
Allowance for loan losses: Recoveries |  |  | 22,138 | 8,477 |
Allowance for loan losses: Net provision for loan losses |  |  | 43,656 | 45,847 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 74,539 | 71,961 |
Allowance for loan losses: Ending balance | 78,467 | 74,341 | 78,467 | 74,341 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 1,344 | 1,395 |
Reserve for unfunded lending commitments: Provision for losses |  |  | (353) | 39 |
Reserve for unfunded lending commitments: Ending balance | 991 | 1,434 | 991 | 1,434 |
Total allowance for credit losses | 79,458 | 75,775 | 79,458 | 75,775 |
Allowance for loan losses: Individually evaluated |  | 0 |  | 0 |
Allowance for loan losses: Collectively evaluated | 78,467 | 74,341 | 78,467 | 74,341 |
Reserve for unfunded lending commitments: Individually evaluated |  | 0 |  | 0 |
Reserve for unfunded lending commitments: Collectively evaluated | 991 | 1,434 | 991 | 1,434 |
Loans: Individually evaluated for impairment | 1,679 | 0 | 1,679 | 0 |
Loans: Collectively evaluated for impairment | 3,986,982 | 4,027,553 | 3,986,982 | 4,027,553 |
Total loans | 3,988,661 | 4,027,553 | 3,988,661 | 4,027,553 | 3,986,943
Total Commercial [Member] | Construction and Land Development [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 27,039 | 30,498 |
Allowance for loan losses: Ending balance | 24,793 | 28,223 | 24,793 | 28,223 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 20,019 | 25,110 |
Reserve for unfunded lending commitments: Provision for losses |  |  | (4,250) | (3,874) |
Reserve for unfunded lending commitments: Ending balance | 15,769 | 21,236 | 15,769 | 21,236 |
Total allowance for credit losses | 40,562 | 49,459 | 40,562 | 49,459 |
Allowance for loan losses: Individually evaluated |  | 0 |  | 0 |
Allowance for loan losses: Collectively evaluated | 24,793 | 28,223 | 24,793 | 28,223 |
Reserve for unfunded lending commitments: Individually evaluated |  | 0 |  | 0 |
Reserve for unfunded lending commitments: Collectively evaluated | 15,769 | 21,236 | 15,769 | 21,236 |
Loans: Individually evaluated for impairment | 5,694 | 0 | 5,694 | 0 |
Loans: Collectively evaluated for impairment | 1,417,921 | 1,614,846 | 1,417,921 | 1,614,846 |
Total loans | 1,423,615 | 1,614,846 | 1,423,615 | 1,614,846 | 1,551,091
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 |  |  | (8,819) | (73) |
Allowance for loan losses: Recoveries |  |  | 7 | 12 |
Allowance for loan losses: Net provision for loan losses |  |  | 12,740 | 2,441 |
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 |  |  | (264) | (72) |
Allowance for loan losses: Recoveries |  |  | 62 | 10 |
Allowance for loan losses: Net provision for loan losses |  |  | (2,044) | (2,213) |
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 141,934 | 144,745 |
Allowance for loan losses: Ending balance | 146,283 | 141,244 | 146,283 | 141,244 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 5,834 | 5,286 |
Reserve for unfunded lending commitments: Provision for losses |  |  | 709 | 280 |
Reserve for unfunded lending commitments: Ending balance | 6,543 | 5,566 | 6,543 | 5,566 |
Total allowance for credit losses | 152,826 | 146,810 | 152,826 | 146,810 |
Allowance for loan losses: Individually evaluated | 4,334 | 0 | 4,334 | 0 |
Allowance for loan losses: Collectively evaluated | 141,949 | 139,578 | 141,949 | 139,578 |
Reserve for unfunded lending commitments: Individually evaluated | 713 | 1,666 | 713 | 1,666 |
Reserve for unfunded lending commitments: Collectively evaluated | 5,830 | 5,566 | 5,830 | 5,566 |
Loans: Individually evaluated for impairment | 13,654 | 17,658 | 13,654 | 17,658 |
Loans: Collectively evaluated for impairment | 12,670,828 | 13,139,254 | 12,670,828 | 13,139,254 |
Total loans | 12,684,482 | 13,156,912 | 12,684,482 | 13,156,912 | 13,051,047
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 |  |  | 101,737 | 96,461 |
Allowance for loan losses: Ending balance | 108,743 | 99,665 | 108,743 | 99,665 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 5,507 | 4,984 |
Reserve for unfunded lending commitments: Provision for losses |  |  | 752 | 270 |
Reserve for unfunded lending commitments: Ending balance | 6,259 | 5,254 | 6,259 | 5,254 |
Total allowance for credit losses | 115,002 | 104,919 | 115,002 | 104,919 |
Allowance for loan losses: Individually evaluated | 4,283 | 0 | 4,283 | 0 |
Allowance for loan losses: Collectively evaluated | 104,460 | 97,999 | 104,460 | 97,999 |
Reserve for unfunded lending commitments: Individually evaluated | 713 | 1,666 | 713 | 1,666 |
Reserve for unfunded lending commitments: Collectively evaluated | 5,546 | 5,254 | 5,546 | 5,254 |
Loans: Individually evaluated for impairment | 12,435 | 17,658 | 12,435 | 17,658 |
Loans: Collectively evaluated for impairment | 9,575,874 | 10,057,927 | 9,575,874 | 10,057,927 |
Total loans | 9,588,309 | 10,075,585 | 9,588,309 | 10,075,585 | 9,957,284
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 40,197 | 48,284 |
Allowance for loan losses: Ending balance | 37,540 | 41,579 | 37,540 | 41,579 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 327 | 302 |
Reserve for unfunded lending commitments: Provision for losses |  |  | (43) | 10 |
Reserve for unfunded lending commitments: Ending balance | 284 | 312 | 284 | 312 |
Total allowance for credit losses | 37,824 | 41,891 | 37,824 | 41,891 |
Allowance for loan losses: Individually evaluated | 51 | 0 | 51 | 0 |
Allowance for loan losses: Collectively evaluated | 37,489 | 41,579 | 37,489 | 41,579 |
Reserve for unfunded lending commitments: Collectively evaluated | 284 | 312 | 284 | 312 |
Loans: Individually evaluated for impairment | 1,219 | 0 | 1,219 | 0 |
Loans: Collectively evaluated for impairment | 3,094,954 | 3,081,327 | 3,094,954 | 3,081,327 |
Total loans | 3,096,173 | 3,081,327 | 3,096,173 | 3,081,327 | 3,093,763
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 |  |  | (33,869) | (44,837) |
Allowance for loan losses: Recoveries |  |  | 19,053 | 4,866 |
Allowance for loan losses: Net provision for loan losses |  |  | 19,165 | 36,470 |
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 |  |  | (33,869) | (44,837) |
Allowance for loan losses: Recoveries |  |  | 18,067 | 4,419 |
Allowance for loan losses: Net provision for loan losses |  |  | 22,808 | 43,622 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Non-Purchased Credit Impaired Loans [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  |  | 0 |
Allowance for loan losses: Recoveries |  |  | 986 | 447 |
Allowance for loan losses: Net provision for loan losses |  |  | (3,643) | (7,152) |
Residential Mortgages [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 38,983 | 32,464 |
Allowance for loan losses: Ending balance | 42,857 | 36,862 | 42,857 | 36,862 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 30 | 31 |
Reserve for unfunded lending commitments: Provision for losses |  |  | (27) | 4 |
Reserve for unfunded lending commitments: Ending balance | 3 | 35 | 3 | 35 |
Total allowance for credit losses | 42,860 | 36,897 | 42,860 | 36,897 |
Allowance for loan losses: Individually evaluated | 750 | 0 | 750 | 0 |
Allowance for loan losses: Collectively evaluated | 42,107 | 36,862 | 42,107 | 36,862 |
Reserve for unfunded lending commitments: Individually evaluated |  | 0 |  | 0 |
Reserve for unfunded lending commitments: Collectively evaluated | 3 | 35 | 3 | 35 |
Loans: Individually evaluated for impairment | 1,893 | 0 | 1,893 | 0 |
Loans: Collectively evaluated for impairment | 3,986,416 | 3,721,106 | 3,986,416 | 3,721,106 |
Total loans | 3,988,309 | 3,721,106 | 3,988,309 | 3,721,106 | 3,886,072
Residential Mortgages [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (229) | (53) |
Allowance for loan losses: Recoveries |  |  | 430 | 888 |
Allowance for loan losses: Net provision for loan losses |  |  | 3,673 | 3,563 |
Consumer [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 25,412 | 28,121 |
Allowance for loan losses: Ending balance | 24,871 | 25,621 | 24,871 | 25,621 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 1,667 | 1,487 |
Reserve for unfunded lending commitments: Provision for losses |  |  | 520 | (145) |
Reserve for unfunded lending commitments: Ending balance | 2,187 | 1,342 | 2,187 | 1,342 |
Total allowance for credit losses | 27,058 | 26,963 | 27,058 | 26,963 |
Allowance for loan losses: Individually evaluated | 197 | 0 | 197 | 0 |
Allowance for loan losses: Collectively evaluated | 24,674 | 25,621 | 24,674 | 25,621 |
Reserve for unfunded lending commitments: Individually evaluated |  | 0 |  | 0 |
Reserve for unfunded lending commitments: Collectively evaluated | 2,187 | 1,342 | 2,187 | 1,342 |
Loans: Individually evaluated for impairment | 3,096 | 0 | 3,096 | 0 |
Loans: Collectively evaluated for impairment | 1,367,424 | 1,463,262 | 1,367,424 | 1,463,262 |
Total loans | $ 1,370,520 | $ 1,463,262 | 1,370,520 | 1,463,262 | $ 1,446,764
Consumer [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (13,249) | (10,787) |
Allowance for loan losses: Recoveries |  |  | 2,586 | 2,701 |
Allowance for loan losses: Net provision for loan losses |  |  | $ 10,122 | $ 5,586 |

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