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Loans and Allowance for Credit Losses - Financing Receivables Past Due (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financing Receivable, Past Due [Line Items]    
Loans $ 23,058,461 $ 22,424,501
30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 14,049 31,881
60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 14,601 15,721
90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans 13,652 17,443
Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 42,302 65,045
Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 23,016,159 22,359,456
Commercial real estate - Owner occupied    
Financing Receivable, Past Due [Line Items]    
Loans 2,954,519 2,802,227
Commercial real estate - Owner occupied | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 2,519 934
Commercial real estate - Owner occupied | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 0 2,672
Commercial real estate - Owner occupied | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans 1,618 1,860
Commercial real estate - Owner occupied | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 4,137 5,466
Commercial real estate - Owner occupied | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 2,950,382 2,796,761
Commercial real estate - Non-owner occupied    
Financing Receivable, Past Due [Line Items]    
Loans 5,219,207 5,203,384
Commercial real estate - Non-owner occupied | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 3,375 726
Commercial real estate - Non-owner occupied | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 359 6,220
Commercial real estate - Non-owner occupied | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans 1,317 3,861
Commercial real estate - Non-owner occupied | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 5,051 10,807
Commercial real estate - Non-owner occupied | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 5,214,156 5,192,577
Consumer real estate – mortgage    
Financing Receivable, Past Due [Line Items]    
Loans 3,540,439 3,099,172
Consumer real estate – mortgage | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 2,593 8,859
Consumer real estate – mortgage | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 7,599 328
Consumer real estate – mortgage | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans 5,265 6,274
Consumer real estate – mortgage | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 15,457 15,461
Consumer real estate – mortgage | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 3,524,982 3,083,711
Construction and land development    
Financing Receivable, Past Due [Line Items]    
Loans 3,096,961 2,901,746
Construction and land development | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 776 278
Construction and land development | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 645 418
Construction and land development | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans 648 736
Construction and land development | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 2,069 1,432
Construction and land development | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 3,094,892 2,900,314
Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
Loans 7,788,153 8,038,457
Commercial and industrial | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 3,410 20,278
Commercial and industrial | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 5,302 5,801
Commercial and industrial | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans 4,557 4,408
Commercial and industrial | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 13,269 30,487
Commercial and industrial | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 7,774,884 8,007,970
Consumer and other    
Financing Receivable, Past Due [Line Items]    
Loans 459,182 379,515
Consumer and other | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 1,376 806
Consumer and other | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans 696 282
Consumer and other | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans 247 304
Consumer and other | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans 2,319 1,392
Consumer and other | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans $ 456,863 $ 378,123