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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, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 176,491 | $ 260,818
Current | 21,613,440 | 20,951,937
Total loans | 21,789,931 | 21,212,755
Recorded Investment > 90 Days and Accruing | 3,361 | 6,582
30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 56,684 | 83,693
60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 19,269 | 30,183
Greater Than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 100,538 | 146,942
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 8,036 | 4,351
Current | 3,349,903 | 2,990,097
Total loans | 3,357,939 | 2,994,448
Recorded Investment > 90 Days and Accruing | 182 | 450
Total Commercial [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 6,453 | 8,907
Current | 1,058,604 | 1,148,544
Total loans | 1,065,057 | 1,157,451
Recorded Investment > 90 Days and Accruing |  | 2,042
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 | 1,494 | 738
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 | 4,168 | 5,747
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 | 798 | 703
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 | 284 | 680
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 | 5,744 | 2,910
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 | 2,001 | 2,480
Total Commercial [Member] | Total Commercial And Industrial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 65,998 | 147,830
Current | 12,778,430 | 11,757,577
Total loans | 12,844,428 | 11,905,407
Recorded Investment > 90 Days and Accruing | 1,538 | 2,367
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 50,057 | 135,144
Current | 9,936,926 | 9,031,803
Total loans | 9,986,983 | 9,166,947
Recorded Investment > 90 Days and Accruing | 583 | 1,537
Total Commercial [Member] | Total Commercial And Industrial [Member] | Commercial Real Estate Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 15,941 | 12,686
Current | 2,841,504 | 2,725,774
Total loans | 2,857,445 | 2,738,460
Recorded Investment > 90 Days and Accruing | 955 | 830
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 | 9,488 | 25,755
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 | 7,963 | 20,893
Total Commercial [Member] | Total Commercial And Industrial [Member] | 30-59 Days Past Due [Member] | Commercial Real Estate Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,525 | 4,862
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 | 3,317 | 14,001
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 | 2,564 | 13,445
Total Commercial [Member] | Total Commercial And Industrial [Member] | 60-89 Days Past Due [Member] | Commercial Real Estate Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 753 | 556
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 | 53,193 | 108,074
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 | 39,530 | 100,806
Total Commercial [Member] | Total Commercial And Industrial [Member] | Greater Than 90 Days Past Due [Member] | Commercial Real Estate Owner Occupied |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 13,663 | 7,268
Residential Portfolio Segment |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 67,063 | 65,028
Current | 2,598,149 | 2,925,603
Total loans | 2,665,212 | 2,990,631
Recorded Investment > 90 Days and Accruing | 912 | 85
Residential Portfolio Segment | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 29,319 | 32,867
Residential Portfolio Segment | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 9,858 | 8,584
Residential Portfolio Segment | Greater Than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 27,886 | 23,577
Consumer Portfolio Segment |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 28,941 | 34,702
Current | 1,828,354 | 2,130,116
Total loans | 1,857,295 | 2,164,818
Recorded Investment > 90 Days and Accruing | 729 | 1,638
Consumer Portfolio Segment | 30-59 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 12,215 | 18,586
Consumer Portfolio Segment | 60-89 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 5,012 | 6,215
Consumer Portfolio Segment | Greater Than 90 Days Past Due [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 11,714 | $ 9,901

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