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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | $ 307,789 | $ 342,065 |
Allowance for loan losses: Net provision for loan losses | $ 7,633 | $ (9,761) | 13,653 | (32,288) |
Allowance for loan losses: Ending balance | 314,496 | 308,175 | 314,496 | 308,175 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 33,309 | 29,334 |
Reserve for unfunded lending commitments: Provision for losses |  |  | 2,149 | 1,969 |
Reserve for unfunded lending commitments: Ending balance | 31,160 | 31,303 | 31,160 | 31,303 |
Total allowance for credit losses | 345,656 | 339,478 | 345,656 | 339,478 |
Allowance for loan losses: Individually evaluated | 7,501 | 636 | 7,501 | 636 |
Allowance for loan losses: Collectively evaluated | 306,995 | 307,539 | 306,995 | 307,539 |
Reserve for unfunded lending commitments: Collectively evaluated | 31,160 | 31,303 | 31,160 | 31,303 |
Loans: Individually evaluated for impairment | 37,507 | 8,801 | 37,507 | 8,801 |
Loans: Collectively evaluated for impairment | 23,752,379 | 21,837,267 | 23,752,379 | 21,837,267 |
Total loans | 23,789,886 | 21,846,068 | 23,789,886 | 21,846,068 | $ 23,114,046
Non-Purchased Credit Impaired Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (14,588) | (11,360) |
Allowance for loan losses: Recoveries |  |  | 5,493 | 11,727 |
Allowance for loan losses: Net provision for loan losses |  |  | 15,802 | (34,257) |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 71,961 | 108,058 |
Allowance for loan losses: Ending balance | 77,141 | 82,951 | 77,141 | 82,951 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 1,395 | 1,694 |
Reserve for unfunded lending commitments: Provision for losses |  |  | 28 | 274 |
Reserve for unfunded lending commitments: Ending balance | 1,423 | 1,420 | 1,423 | 1,420 |
Total allowance for credit losses | 78,564 | 84,371 | 78,564 | 84,371 |
Allowance for loan losses: Individually evaluated |  | 18 |  | 18 |
Allowance for loan losses: Collectively evaluated | 77,141 | 82,933 | 77,141 | 82,933 |
Reserve for unfunded lending commitments: Collectively evaluated | 1,423 | 1,420 | 1,423 | 1,420 |
Loans: Individually evaluated for impairment |  | 1,289 |  | 1,289 |
Loans: Collectively evaluated for impairment | 3,762,428 | 3,639,954 | 3,762,428 | 3,639,954 |
Total loans | 3,762,428 | 3,641,243 | 3,762,428 | 3,641,243 | 3,560,991
Total Commercial [Member] | Construction and Land Development [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 30,498 | 22,102 |
Allowance for loan losses: Ending balance | 31,344 | 24,703 | 31,344 | 24,703 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 25,110 | 21,907 |
Reserve for unfunded lending commitments: Provision for losses |  |  | 2,227 | (1,598) |
Reserve for unfunded lending commitments: Ending balance | 22,883 | 23,505 | 22,883 | 23,505 |
Total allowance for credit losses | 54,227 | 48,208 | 54,227 | 48,208 |
Allowance for loan losses: Individually evaluated |  | 19 |  | 19 |
Allowance for loan losses: Collectively evaluated | 31,344 | 24,684 | 31,344 | 24,684 |
Reserve for unfunded lending commitments: Collectively evaluated | 22,883 | 23,505 | 22,883 | 23,505 |
Loans: Individually evaluated for impairment |  | 120 |  | 120 |
Loans: Collectively evaluated for impairment | 1,768,252 | 1,408,607 | 1,768,252 | 1,408,607 |
Total loans | 1,768,252 | 1,408,727 | 1,768,252 | 1,408,727 | 1,703,592
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 |  |  | (73) | (1,066) |
Allowance for loan losses: Recoveries |  |  | 10 | 878 |
Allowance for loan losses: Net provision for loan losses |  |  | 5,243 | (24,919) |
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 |  |  | (72) | (3) |
Allowance for loan losses: Recoveries |  |  | 6 | 126 |
Allowance for loan losses: Net provision for loan losses |  |  | 912 | 2,478 |
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 144,745 | 149,321 |
Allowance for loan losses: Ending balance | 142,490 | 142,434 | 142,490 | 142,434 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 5,286 | 4,845 |
Reserve for unfunded lending commitments: Provision for losses |  |  | (39) | 91 |
Reserve for unfunded lending commitments: Ending balance | 5,325 | 4,936 | 5,325 | 4,936 |
Total allowance for credit losses | 147,815 | 147,370 | 147,815 | 147,370 |
Allowance for loan losses: Individually evaluated | 7,501 | 107 | 7,501 | 107 |
Allowance for loan losses: Collectively evaluated | 134,989 | 142,327 | 134,989 | 142,327 |
Reserve for unfunded lending commitments: Collectively evaluated | 5,325 | 4,936 | 5,325 | 4,936 |
Loans: Individually evaluated for impairment | 36,372 | 2,496 | 36,372 | 2,496 |
Loans: Collectively evaluated for impairment | 13,136,389 | 12,607,070 | 13,136,389 | 12,607,070 |
Total loans | 13,172,761 | 12,609,566 | 13,172,761 | 12,609,566 | 13,179,511
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 |  |  | 96,461 | 95,888 |
Allowance for loan losses: Ending balance | 96,195 | 92,819 | 96,195 | 92,819 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 4,984 | 4,522 |
Reserve for unfunded lending commitments: Provision for losses |  |  | (12) | 51 |
Reserve for unfunded lending commitments: Ending balance | 4,996 | 4,573 | 4,996 | 4,573 |
Total allowance for credit losses | 101,191 | 97,392 | 101,191 | 97,392 |
Allowance for loan losses: Individually evaluated | 7,501 | 76 | 7,501 | 76 |
Allowance for loan losses: Collectively evaluated | 88,694 | 92,743 | 88,694 | 92,743 |
Reserve for unfunded lending commitments: Collectively evaluated | 4,996 | 4,573 | 4,996 | 4,573 |
Loans: Individually evaluated for impairment | 35,697 | 1,559 | 35,697 | 1,559 |
Loans: Collectively evaluated for impairment | 10,078,235 | 9,643,533 | 10,078,235 | 9,643,533 |
Total loans | 10,113,932 | 9,645,092 | 10,113,932 | 9,645,092 | 10,146,453
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 |  |  | 48,284 | 53,433 |
Allowance for loan losses: Ending balance | 46,295 | 49,615 | 46,295 | 49,615 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 302 | 323 |
Reserve for unfunded lending commitments: Provision for losses |  |  | 27 | 40 |
Reserve for unfunded lending commitments: Ending balance | 329 | 363 | 329 | 363 |
Total allowance for credit losses | 46,624 | 49,978 | 46,624 | 49,978 |
Allowance for loan losses: Individually evaluated |  | 31 |  | 31 |
Allowance for loan losses: Collectively evaluated | 46,295 | 49,584 | 46,295 | 49,584 |
Reserve for unfunded lending commitments: Collectively evaluated | 329 | 363 | 329 | 363 |
Loans: Individually evaluated for impairment | 675 | 937 | 675 | 937 |
Loans: Collectively evaluated for impairment | 3,058,154 | 2,963,537 | 3,058,154 | 2,963,537 |
Total loans | 3,058,829 | 2,964,474 | 3,058,829 | 2,964,474 | 3,033,058
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 |  |  | (7,503) | (4,604) |
Allowance for loan losses: Recoveries |  |  | 3,044 | 7,094 |
Allowance for loan losses: Net provision for loan losses |  |  | 2,204 | (9,377) |
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 |  |  | (7,503) | (3,747) |
Allowance for loan losses: Recoveries |  |  | 2,694 | 6,603 |
Allowance for loan losses: Net provision for loan losses |  |  | 4,543 | (5,925) |
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 |  |  |  | (857) |
Allowance for loan losses: Recoveries |  |  | 350 | 491 |
Allowance for loan losses: Net provision for loan losses |  |  | (2,339) | (3,452) |
Residential Mortgages [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 32,464 | 30,623 |
Allowance for loan losses: Ending balance | 36,597 | 28,584 | 36,597 | 28,584 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 31 | 22 |
Reserve for unfunded lending commitments: Provision for losses |  |  | (8) | 2 |
Reserve for unfunded lending commitments: Ending balance | 23 | 24 | 23 | 24 |
Total allowance for credit losses | 36,620 | 28,608 | 36,620 | 28,608 |
Allowance for loan losses: Individually evaluated |  | 322 |  | 322 |
Allowance for loan losses: Collectively evaluated | 36,597 | 28,262 | 36,597 | 28,262 |
Reserve for unfunded lending commitments: Collectively evaluated | 23 | 24 | 23 | 24 |
Loans: Individually evaluated for impairment | 1,135 | 3,991 | 1,135 | 3,991 |
Loans: Collectively evaluated for impairment | 3,580,379 | 2,611,816 | 3,580,379 | 2,611,816 |
Total loans | 3,581,514 | 2,615,807 | 3,581,514 | 2,615,807 | 3,092,605
Residential Mortgages [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (28) | (60) |
Allowance for loan losses: Recoveries |  |  | 480 | 527 |
Allowance for loan losses: Net provision for loan losses |  |  | 3,681 | (2,506) |
Consumer [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Beginning balance |  |  | 28,121 | 31,961 |
Allowance for loan losses: Ending balance | 26,924 | 29,503 | 26,924 | 29,503 |
Reserve for unfunded lending commitments: Beginning balance |  |  | 1,487 | 866 |
Reserve for unfunded lending commitments: Provision for losses |  |  | (19) | 552 |
Reserve for unfunded lending commitments: Ending balance | 1,506 | 1,418 | 1,506 | 1,418 |
Total allowance for credit losses | 28,430 | 30,921 | 28,430 | 30,921 |
Allowance for loan losses: Individually evaluated |  | 170 |  | 170 |
Allowance for loan losses: Collectively evaluated | 26,924 | 29,333 | 26,924 | 29,333 |
Reserve for unfunded lending commitments: Collectively evaluated | 1,506 | 1,418 | 1,506 | 1,418 |
Loans: Individually evaluated for impairment |  | 905 |  | 905 |
Loans: Collectively evaluated for impairment | 1,504,931 | 1,569,820 | 1,504,931 | 1,569,820 |
Total loans | $ 1,504,931 | $ 1,570,725 | 1,504,931 | 1,570,725 | $ 1,577,347
Consumer [Member] | Non-Purchased Credit Impaired Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Allowance for loan losses: Charge-offs |  |  | (6,912) | (5,627) |
Allowance for loan losses: Recoveries |  |  | 1,953 | 3,102 |
Allowance for loan losses: Net provision for loan losses |  |  | $ 3,762 | $ 67 |

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