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Loans and Allowance for Credit Losses - Financing Receivables Past Due (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income $ 23,086,701 $ 22,424,501
30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 20,770 31,881
60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 3,977 15,721
90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 16,401 17,443
Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 41,148 65,045
Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 23,045,553 22,359,456
Commercial real estate - Owner occupied    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 2,869,785 2,802,227
Commercial real estate - Owner occupied | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 1,906 934
Commercial real estate - Owner occupied | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 69 2,672
Commercial real estate - Owner occupied | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 2,957 1,860
Commercial real estate - Owner occupied | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 4,932 5,466
Commercial real estate - Owner occupied | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 2,864,853 2,796,761
Commercial real estate - Non-owner occupied    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 5,573,181 5,203,384
Commercial real estate - Non-owner occupied | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 1,714 726
Commercial real estate - Non-owner occupied | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 0 6,220
Commercial real estate - Non-owner occupied | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 2,526 3,861
Commercial real estate - Non-owner occupied | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 4,240 10,807
Commercial real estate - Non-owner occupied | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 5,568,941 5,192,577
Consumer real estate – mortgage    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 3,086,916 3,099,172
Consumer real estate – mortgage | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 5,303 8,859
Consumer real estate – mortgage | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 790 328
Consumer real estate – mortgage | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 5,816 6,274
Consumer real estate – mortgage | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 11,909 15,461
Consumer real estate – mortgage | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 3,075,007 3,083,711
Construction and land development    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 2,568,969 2,901,746
Construction and land development | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 137 278
Construction and land development | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 0 418
Construction and land development | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 383 736
Construction and land development | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 520 1,432
Construction and land development | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 2,568,449 2,900,314
Commercial and industrial    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 8,576,528 8,038,457
Commercial and industrial | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 10,913 20,278
Commercial and industrial | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 2,895 5,801
Commercial and industrial | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 4,377 4,408
Commercial and industrial | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 18,185 30,487
Commercial and industrial | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 8,558,343 8,007,970
Consumer and other    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 411,322 379,515
Consumer and other | 30-59 days past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 797 806
Consumer and other | 60-89 days past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 223 282
Consumer and other | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 342 304
Consumer and other | Financial Asset, Past Due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income 1,362 1,392
Consumer and other | Financial Asset, Not Past Due    
Financing Receivable, Past Due [Line Items]    
Loans and Leases Receivable, Net of Deferred Income $ 409,960 $ 378,123