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Loans and Allowance for Loan Losses, Financing Receivables Past Due (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans $ 23,414,262 $ 22,424,501
Financial Asset, 30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 17,573 31,881
Financial Asset, 60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 3,367 15,721
Financial Asset, Equal to or Greater than 90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 15,331 17,443
Financial Asset, Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 36,271 65,045
Financial Asset, Not Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 23,377,991 22,359,456
Commercial Real Estate Owner Occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 3,048,822 2,802,227
Commercial Real Estate Owner Occupied | Financial Asset, 30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 727 934
Commercial Real Estate Owner Occupied | Financial Asset, 60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 0 2,672
Commercial Real Estate Owner Occupied | Financial Asset, Equal to or Greater than 90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,426 1,860
Commercial Real Estate Owner Occupied | Financial Asset, Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 3,153 5,466
Commercial Real Estate Owner Occupied | Financial Asset, Not Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 3,045,669 2,796,761
Commercial real estate non owner occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 5,221,704 5,203,384
Commercial real estate non owner occupied | Financial Asset, 30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 1,434 726
Commercial real estate non owner occupied | Financial Asset, 60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 0 6,220
Commercial real estate non owner occupied | Financial Asset, Equal to or Greater than 90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 645 3,861
Commercial real estate non owner occupied | Financial Asset, Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,079 10,807
Commercial real estate non owner occupied | Financial Asset, Not Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 5,219,625 5,192,577
Consumer Real Estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 3,680,684 3,099,172
Consumer Real Estate | Financial Asset, 30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 8,710 8,859
Consumer Real Estate | Financial Asset, 60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 122 328
Consumer Real Estate | Financial Asset, Equal to or Greater than 90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 4,450 6,274
Consumer Real Estate | Financial Asset, Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 13,282 15,461
Consumer Real Estate | Financial Asset, Not Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 3,667,402 3,083,711
Construction and Land Development    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,903,017 2,901,746
Construction and Land Development | Financial Asset, 30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 61 278
Construction and Land Development | Financial Asset, 60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 0 418
Construction and Land Development | Financial Asset, Equal to or Greater than 90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 127 736
Construction and Land Development | Financial Asset, Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 188 1,432
Construction and Land Development | Financial Asset, Not Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,902,829 2,900,314
Commercial and Industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 8,074,546 8,038,457
Commercial and Industrial | Financial Asset, 30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 4,926 20,278
Commercial and Industrial | Financial Asset, 60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,677 5,801
Commercial and Industrial | Financial Asset, Equal to or Greater than 90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 7,311 4,408
Commercial and Industrial | Financial Asset, Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 14,914 30,487
Commercial and Industrial | Financial Asset, Not Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 8,059,632 8,007,970
Consumer and Other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 485,489 379,515
Consumer and Other | Financial Asset, 30 to 59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 1,715 806
Consumer and Other | Financial Asset, 60 to 89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 568 282
Consumer and Other | Financial Asset, Equal to or Greater than 90 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 372 304
Consumer and Other | Financial Asset, Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,655 1,392
Consumer and Other | Financial Asset, Not Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans $ 482,834 $ 378,123