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Loans and Allowance for Credit Losses - Financing Receivables Past Due (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Financing Receivable, Past Due [Line Items]    
Loans $ 22,897,935 $ 22,424,501
30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 8,805 31,881
60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 9,393 15,721
90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans 12,265 17,443
Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 30,463 65,045
Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 22,867,472 22,359,456
Commercial real estate - Owner occupied    
Financing Receivable, Past Due [Line Items]    
Loans 2,817,689 2,802,227
Commercial real estate - Owner occupied | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 1,301 934
Commercial real estate - Owner occupied | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 902 2,672
Commercial real estate - Owner occupied | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans 997 1,860
Commercial real estate - Owner occupied | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 3,200 5,466
Commercial real estate - Owner occupied | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 2,814,489 2,796,761
Commercial real estate - Non-owner occupied    
Financing Receivable, Past Due [Line Items]    
Loans 5,368,804 5,203,384
Commercial real estate - Non-owner occupied | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 1,753 726
Commercial real estate - Non-owner occupied | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 278 6,220
Commercial real estate - Non-owner occupied | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans 1,966 3,861
Commercial real estate - Non-owner occupied | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 3,997 10,807
Commercial real estate - Non-owner occupied | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 5,364,807 5,192,577
Consumer real estate – mortgage    
Financing Receivable, Past Due [Line Items]    
Loans 3,335,537 3,099,172
Consumer real estate – mortgage | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 1,997 8,859
Consumer real estate – mortgage | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 6,128 328
Consumer real estate – mortgage | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans 3,370 6,274
Consumer real estate – mortgage | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 11,495 15,461
Consumer real estate – mortgage | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 3,324,042 3,083,711
Construction and land development    
Financing Receivable, Past Due [Line Items]    
Loans 2,791,611 2,901,746
Construction and land development | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 0 278
Construction and land development | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 0 418
Construction and land development | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans 135 736
Construction and land development | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 135 1,432
Construction and land development | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 2,791,476 2,900,314
Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
Loans 8,144,170 8,038,457
Commercial and industrial | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 3,002 20,278
Commercial and industrial | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 1,634 5,801
Commercial and industrial | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans 5,511 4,408
Commercial and industrial | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 10,147 30,487
Commercial and industrial | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 8,134,023 8,007,970
Consumer and other    
Financing Receivable, Past Due [Line Items]    
Loans 440,124 379,515
Consumer and other | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 752 806
Consumer and other | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 451 282
Consumer and other | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans 286 304
Consumer and other | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 1,489 1,392
Consumer and other | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans $ 438,635 $ 378,123