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Loans and Allowance for Credit Losses (Aging Analysis of Past Due Loans by Portfolio Class) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2021
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | $ 21,846,068 | $ 21,134,282 | $ 21,148,530
Recorded Investment > 90 Days and Accruing | 4,745 | 5,524 |
30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 32,809 | 42,102 |
60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 18,093 | 12,348 |
Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 28,307 | 37,284 |
Total Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 79,209 | 91,734 |
Current [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 21,766,859 | 21,042,548 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 3,641,243 | 3,464,626 | 3,419,028
Recorded Investment > 90 Days and Accruing | 1,244 |  |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 1,440 | 281 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans |  | 107 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 2,567 | 5,307 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Total Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 4,007 | 5,695 |
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] | Current [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 3,637,236 | 3,458,931 |
Total Commercial [Member] | Construction and Land Development [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 1,408,727 | 1,228,670 | 1,295,036
Recorded Investment > 90 Days and Accruing | 53 | 83 |
Total Commercial [Member] | Construction and Land Development [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 214 | 2,624 |
Total Commercial [Member] | Construction and Land Development [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 656 | 1,022 |
Total Commercial [Member] | Construction and Land Development [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 346 | 587 |
Total Commercial [Member] | Construction and Land Development [Member] | Total Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 1,216 | 4,233 |
Total Commercial [Member] | Construction and Land Development [Member] | Current [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 1,407,511 | 1,224,437 |
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 12,609,566 | 12,433,706 | 12,342,578
Recorded Investment > 90 Days and Accruing | 2,139 | 2,960 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 20,314 | 9,085 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 9,621 | 3,776 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 6,813 | 8,604 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Total Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 36,748 | 21,465 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Current [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 12,572,818 | 12,412,241 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 9,645,092 | 9,612,460 | 9,532,710
Recorded Investment > 90 Days and Accruing | 1,779 | 2,818 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 13,203 | 8,381 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 8,585 | 3,123 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 5,735 | 7,041 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 27,523 | 18,545 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Current [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 9,617,569 | 9,593,915 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 2,964,474 | 2,821,246 | 2,809,868
Recorded Investment > 90 Days and Accruing | 360 | 142 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 7,111 | 704 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 1,036 | 653 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 1,078 | 1,563 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 9,225 | 2,920 |
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Current [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 2,955,249 | 2,818,326 |
Residential Mortgages [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 2,615,807 | 2,423,890 | 2,412,459
Recorded Investment > 90 Days and Accruing | 150 | 310 |
Residential Mortgages [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 4,366 | 23,306 |
Residential Mortgages [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 5,489 | 4,638 |
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 14,175 | 15,339 |
Residential Mortgages [Member] | Total Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 24,030 | 43,283 |
Residential Mortgages [Member] | Current [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 2,591,777 | 2,380,607 |
Consumer [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 1,570,725 | 1,583,390 | $ 1,679,429
Recorded Investment > 90 Days and Accruing | 1,159 | 2,171 |
Consumer [Member] | 30-59 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 6,475 | 6,806 |
Consumer [Member] | 60-89 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 2,327 | 2,805 |
Consumer [Member] | Greater Than 90 Days Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 4,406 | 7,447 |
Consumer [Member] | Total Past Due [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | 13,208 | 17,058 |
Consumer [Member] | Current [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total loans | $ 1,557,517 | $ 1,566,332 |

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