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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