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Loans and Allowance for Credit Losses (Age Analysis of Past Due Loans by Portfolio Class) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 260,818 | $ 237,050
Current | 20,951,937 | 19,789,361
Total loans | 21,212,755 | 20,026,411
Recorded Investment > 90 Days and Accruing | 6,582 | 14,309
30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 83,693 | 77,690
60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 30,183 | 26,767
Greater Than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 146,942 | 132,593
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 4,351 | 8,638
Current | 2,990,097 | 2,333,141
Total loans | 2,994,448 | 2,341,779
Recorded Investment > 90 Days and Accruing | 450 | 1,844
Total Commercial [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 8,907 | 10,691
Current | 1,148,544 | 1,537,644
Total loans | 1,157,451 | 1,548,335
Recorded Investment > 90 Days and Accruing | 2,042 | 644
Total Commercial [Member] | 30-59 Days Past Due [Member] | Commercial Real Estate - Income Producing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 738 | 2,371
Total Commercial [Member] | 30-59 Days Past Due [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 5,747 | 7,397
Total Commercial [Member] | 60-89 Days Past Due [Member] | Commercial Real Estate - Income Producing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 703 | 772
Total Commercial [Member] | 60-89 Days Past Due [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 680 | 1,129
Total Commercial [Member] | Greater Than 90 Days Past Due [Member] | Commercial Real Estate - Income Producing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 2,910 | 5,495
Total Commercial [Member] | Greater Than 90 Days Past Due [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 2,480 | 2,165
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 147,830 | 112,209
Current | 11,757,577 | 10,966,140
Total loans | 11,905,407 | 11,078,349
Recorded Investment > 90 Days and Accruing | 2,367 | 11,203
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 135,144 | 93,703
Current | 9,031,803 | 8,526,898
Total loans | 9,166,947 | 8,620,601
Recorded Investment > 90 Days and Accruing | 1,537 | 10,823
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 12,686 | 18,506
Current | 2,725,774 | 2,439,242
Total loans | 2,738,460 | 2,457,748
Recorded Investment > 90 Days and Accruing | 830 | 380
Total Commercial [Member] | Total Commercial And Industrial [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 25,755 | 14,651
Total Commercial [Member] | Total Commercial And Industrial [Member] | 30-59 Days Past Due [Member] | Commercial Non-Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 20,893 | 12,257
Total Commercial [Member] | Total Commercial And Industrial [Member] | 30-59 Days Past Due [Member] | Commercial Real Estate - Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 4,862 | 2,394
Total Commercial [Member] | Total Commercial And Industrial [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 14,001 | 5,465
Total Commercial [Member] | Total Commercial And Industrial [Member] | 60-89 Days Past Due [Member] | Commercial Non-Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 13,445 | 3,895
Total Commercial [Member] | Total Commercial And Industrial [Member] | 60-89 Days Past Due [Member] | Commercial Real Estate - Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 556 | 1,570
Total Commercial [Member] | Total Commercial And Industrial [Member] | Greater Than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 108,074 | 92,093
Total Commercial [Member] | Total Commercial And Industrial [Member] | Greater Than 90 Days Past Due [Member] | Commercial Non-Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 100,806 | 77,551
Total Commercial [Member] | Total Commercial And Industrial [Member] | Greater Than 90 Days Past Due [Member] | Commercial Real Estate - Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 7,268 | 14,542
Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 65,028 | 70,750
Current | 2,925,603 | 2,839,331
Total loans | 2,990,631 | 2,910,081
Recorded Investment > 90 Days and Accruing | 85 |
Residential Mortgages [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 32,867 | 32,869
Residential Mortgages [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 8,584 | 14,706
Residential Mortgages [Member] | Greater Than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 23,577 | 23,175
Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 34,702 | 34,762
Current | 2,130,116 | 2,113,105
Total loans | 2,164,818 | 2,147,867
Recorded Investment > 90 Days and Accruing | 1,638 | 618
Consumer [Member] | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 18,586 | 20,402
Consumer [Member] | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 6,215 | 4,695
Consumer [Member] | Greater Than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 9,901 | $ 9,665

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