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Loans and Allowance for Loan Losses Loan Classification by Risk Rating Category (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Receivables [Abstract]      
Percentage of loan portfolio as commercial loan 80.80%    
Risk rated loans $ 1,000,000    
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 17,707,549,000 $ 15,633,116,000 $ 8,449,925,000
Nonaccrual loans [1] 77,248,000 41,519,000  
Average balance of impaired loans 75,257,000 40,830,000 32,474,000
Interest Lost on impaired loans $ 4,200,000 2,700,000 2,100,000
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 $ 37,900,000 26,400,000  
Amount drawn from loans and other extensions of credit granted 18,300,000 16,100,000  
Commercial loans held-for-sale 15,954,000 25,456,000  
Mortgage loans held-for-sale 31,800,000 102,700,000  
Gains on mortgage loans sold, net 14,564,000 18,625,000 15,754,000
Mortgage loans held for sale sold 1,234,551,000 1,090,489,000 803,498,000
Troubled Debt Restructurings      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 5,900,000 6,600,000  
Impaired loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 83,146,000 58,979,000  
Pass | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 17,346,673,000 15,237,775,000  
Special Mention | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 93,163,000 168,713,000  
Substandard | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 179,879,000 169,173,000  
Substandard | Nonaccrual Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 87,834,000 57,455,000  
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 7,164,954,000 6,669,610,000 3,193,496,000
Commercial Real Estate | Pass | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 6,998,485,000 6,487,368,000  
Commercial Real Estate | Special Mention | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 55,932,000 94,134,000  
Commercial Real Estate | Substandard | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 78,202,000 72,044,000  
Commercial Real Estate | Substandard | Nonaccrual Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 32,335,000 16,064,000  
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 2,844,447,000 2,561,214,000 1,185,917,000
Nonaccrual loans [1] 22,564,000 9,320,000  
Consumer Real Estate | Pass | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 2,787,570,000 2,503,688,000  
Consumer Real Estate | Special Mention | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 7,902,000 18,356,000  
Consumer Real Estate | Substandard | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 20,906,000 21,053,000  
Consumer Real Estate | Substandard | Nonaccrual Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 28,069,000 18,117,000  
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 2,072,455,000 1,908,288,000  
Construction and Land Development | Pass | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 2,059,376,000 1,880,704,000  
Construction and Land Development | Special Mention | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 4,334,000 8,148,000  
Construction and Land Development | Substandard | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 5,358,000 13,468,000  
Construction and Land Development | Substandard | Nonaccrual Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 3,387,000 5,968,000  
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 5,271,421,000 4,141,341,000  
Commercial and Industrial | Pass | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 5,148,726,000 4,014,656,000  
Commercial and Industrial | Special Mention | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 24,284,000 46,898,000  
Commercial and Industrial | Substandard | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 75,351,000 62,529,000  
Commercial and Industrial | Substandard | Nonaccrual Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 23,060,000 17,258,000  
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 354,272,000 352,663,000 266,129,000
Nonaccrual loans [1] 983,000 0  
Consumer and Other | Pass | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 352,516,000 351,359,000  
Consumer and Other | Special Mention | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 711,000 1,177,000  
Consumer and Other | Substandard | Accruing Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 62,000 79,000  
Consumer and Other | Substandard | Nonaccrual Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 983,000 48,000  
Consumer and Other | 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 5,271,421,000 4,141,341,000 2,891,710,000
Nonaccrual loans [1] 23,022,000 17,222,000  
Construction and Land Development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 2,072,455,000 1,908,288,000 $ 912,673,000
Nonaccrual loans [1] 2,020,000 2,878,000  
Current and accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 17,545,113,000 15,488,784,000  
Current and accruing | Consumer Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 2,794,630,000 2,521,748,000  
Current and accruing | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 349,537,000 345,076,000  
Current and accruing | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 5,225,205,000 4,114,127,000  
Current and accruing | Construction and Land Development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 2,063,201,000 1,894,560,000  
Financing Receivables 30 To 89 Days Past Due and Still Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 58,301,000 56,019,000  
Financing Receivables 30 To 89 Days Past Due and Still Accruing | Consumer Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 18,059,000 14,835,000  
Financing Receivables 30 To 89 Days Past Due and Still Accruing | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 3,276,000 6,311,000  
Financing Receivables 30 To 89 Days Past Due and Still Accruing | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 21,451,000 7,406,000  
Financing Receivables 30 To 89 Days Past Due and Still Accruing | Construction and Land Development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 3,759,000 4,136,000  
Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,558,000 4,139,000  
Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing | Consumer Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 0 1,265,000  
Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 476,000 1,276,000  
Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,082,000 1,348,000  
Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing | Construction and Land Development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 0 146,000  
Past Due and Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 59,859,000 60,158,000  
Past Due and Accruing | Consumer Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 18,059,000 16,100,000  
Past Due and Accruing | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 3,752,000 7,587,000  
Past Due and Accruing | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 22,533,000 8,754,000  
Past Due and Accruing | Construction and Land Development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 3,759,000 4,282,000  
Commercial Real Estate Owner Occupied | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans [1] 16,025,000 11,395,000  
Commercial Real Estate Owner Occupied | Current and accruing | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 2,623,700,000 2,435,819,000  
Commercial Real Estate Owner Occupied | Financing Receivables 30 To 89 Days Past Due and Still Accruing | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 10,170,000 6,772,000  
Commercial Real Estate Owner Occupied | Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 0 104,000  
Commercial Real Estate Owner Occupied | Past Due and Accruing | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 10,170,000 6,876,000  
Commercial Real Estate All Other | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans [1] 12,634,000 704,000  
Commercial Real Estate All Other | Current and accruing | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 4,488,840,000 4,177,454,000  
Commercial Real Estate All Other | Financing Receivables 30 To 89 Days Past Due and Still Accruing | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,586,000 16,559,000  
Commercial Real Estate All Other | Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 0 0  
Commercial Real Estate All Other | Past Due and Accruing | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,586,000 16,559,000  
Purchase credit impaired, nonaccruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 10,586,000 15,936,000  
Purchase credit impaired, nonaccruing | Consumer Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 5,505,000 8,797,000  
Purchase credit impaired, nonaccruing | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 0 0  
Purchase credit impaired, nonaccruing | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 38,000 84,000  
Purchase credit impaired, nonaccruing | Construction and Land Development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 1,367,000 3,090,000  
Purchase credit impaired, nonaccruing | Commercial Real Estate Owner Occupied | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 874,000 1,105,000  
Purchase credit impaired, nonaccruing | Commercial Real Estate All Other | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Nonaccrual loans 2,802,000 2,860,000  
Purchase credit impaired, accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 14,743,000 26,719,000  
Purchase credit impaired, accruing | Consumer Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 3,689,000 5,249,000  
Purchase credit impaired, accruing | Consumer and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 0 0  
Purchase credit impaired, accruing | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 623,000 1,154,000  
Purchase credit impaired, accruing | Construction and Land Development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 2,108,000 3,478,000  
Purchase credit impaired, accruing | Commercial Real Estate Owner Occupied | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 2,664,000 4,820,000  
Purchase credit impaired, accruing | Commercial Real Estate All Other | Commercial Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 5,659,000 $ 12,018,000  
Construction and Land Development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of credit exposure to risk based capital 85.20% 89.40%  
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 277.70% 297.10%  
[1] (1)Approximately $52.5 million and $45.8 million of nonaccrual loans as of December 31, 2018 and December 31, 2017, respectively, were performing pursuant to their contractual terms at those dates.