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Loans and Allowance for Loan Losses Loan Classification by Risk Rating Category (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Receivables [Abstract]      
Percentage of loan portfolio as commercial loan 80.30%    
Risk rated loans $ 1,000    
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 19,787,876 $ 17,707,549 $ 15,633,116
Nonaccrual loans [1] 53,939 77,248  
Average balance of impaired loans 76,919 75,257 40,830
Interest Lost on impaired loans $ 3,000 4,200 2,700
Percentage of credit exposure to risk based capital 25.00%    
Loans and other extensions of credit granted to directors, executive officers, and their related entities $ 10,600 37,900  
Amount drawn from loans and other extensions of credit granted 6,800 18,300  
Commercial loans held-for-sale 17,585 15,954  
Mortgage loans held-for-sale 61,600 31,800  
Gains on mortgage loans sold, net 24,335 14,564 18,625
Mortgage Loan Volumes Sold 1,100,000 1,000,000  
Troubled Debt Restructurings      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 4,900 5,900  
Impaired loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 58,100 83,100  
Pass | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 19,299,393 17,346,673  
Special Mention | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 148,267 93,163  
Substandard | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 278,611 179,879  
Substandard | Nonaccrual Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 61,605 87,834  
Doubtful | Nonaccrual Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 0 0  
Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 7,709,218 7,164,954 6,669,610
Commercial Real Estate | Pass | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 7,499,725 6,998,485  
Commercial Real Estate | Special Mention | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 51,147 55,932  
Commercial Real Estate | Substandard | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 139,518 78,202  
Commercial Real Estate | Substandard | Nonaccrual Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 18,828 32,335  
Commercial Real Estate | Doubtful | Nonaccrual Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 0 0  
Consumer Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 3,068,625 2,844,447 2,561,214
Nonaccrual loans [1] 20,995 22,564  
Consumer Real Estate | Pass | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 3,019,203 2,787,570  
Consumer Real Estate | Special Mention | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 13,787 7,902  
Consumer Real Estate | Substandard | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 10,969 20,906  
Consumer Real Estate | Substandard | Nonaccrual Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 24,666 28,069  
Consumer Real Estate | Doubtful | Nonaccrual Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 0 0  
Construction and Land Development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 2,430,483 2,072,455  
Construction and Land Development | Pass | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 2,422,347 2,059,376  
Construction and Land Development | Special Mention | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 2,816 4,334  
Construction and Land Development | Substandard | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 3,042 5,358  
Construction and Land Development | Substandard | Nonaccrual Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 2,278 3,387  
Construction and Land Development | Doubtful | Nonaccrual Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 0 0  
Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 6,290,296 5,271,421  
Commercial and Industrial | Pass | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 6,069,757 5,148,726  
Commercial and Industrial | Special Mention | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 79,819 24,284  
Commercial and Industrial | Substandard | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 125,035 75,351  
Commercial and Industrial | Substandard | Nonaccrual Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 15,685 23,060  
Commercial and Industrial | Doubtful | Nonaccrual Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 0 0  
Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 289,254 354,272 $ 352,663
Nonaccrual loans [1] 148 983  
Consumer and Other | Pass | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 288,361 352,516  
Consumer and Other | Special Mention | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 698 711  
Consumer and Other | Substandard | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 47 62  
Consumer and Other | Substandard | Nonaccrual Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 148 983  
Consumer and Other | Doubtful | Nonaccrual Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 0 0  
Commercial Real Estate Owner Occupied | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans [1] 10,791 16,025  
Commercial Real Estate All Other | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans [1] 7,169 12,634  
Purchase credit impaired, nonaccruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 7,666 10,586  
Purchase credit impaired, nonaccruing | Consumer Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 3,671 5,505  
Purchase credit impaired, nonaccruing | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 0 0  
Purchase credit impaired, nonaccruing | Commercial Real Estate Owner Occupied | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 863 874  
Purchase credit impaired, nonaccruing | Commercial Real Estate All Other | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 5 2,802  
Purchase credit impaired, accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 13,249 14,743  
Purchase credit impaired, accruing | Consumer Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 3,014 3,689  
Purchase credit impaired, accruing | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 0 0  
Purchase credit impaired, accruing | Commercial Real Estate Owner Occupied | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 3,366 2,664  
Purchase credit impaired, accruing | Commercial Real Estate All Other | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 5,254 $ 5,659  
Construction and Land Development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of credit exposure to risk based capital 83.60% 85.20%  
Non-owner occupied commercial real estate and multifamily loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of credit exposure to risk based capital 268.30% 277.70%  
[1] Approximately $35.8 million and $52.5 million of nonaccrual loans as of December 31, 2019 and December 31, 2018, respectively, were performing pursuant to their contractual terms at those dates.