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Loans and Allowance for Loan Losses - Financing Receivables Past Due (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans $ 17,042,853,000 $ 15,633,116,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest [1] 58,216,000 41,519,000
Currently performing impaired loans 54,400,000 45,800,000
Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 22,992,000 26,719,000
Purchased credit impaired, nonaccruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest 12,669,000 15,936,000
Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 38,382,000 60,158,000
30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 36,810,000 56,019,000
90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 1,572,000 4,139,000
Current and Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 16,910,594,000 15,488,784,000
Commercial real estate - mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 7,024,639,000 6,669,610,000
Commercial real estate - mortgage | Owner-occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,504,890,000 2,460,015,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest [1] 22,874,000 11,395,000
Commercial real estate - mortgage | Owner-occupied | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 3,424,000 4,820,000
Commercial real estate - mortgage | Owner-occupied | Purchased credit impaired, nonaccruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest 2,164,000 1,105,000
Commercial real estate - mortgage | Owner-occupied | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,132,000 6,876,000
Commercial real estate - mortgage | Owner-occupied | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,132,000 6,772,000
Commercial real estate - mortgage | Owner-occupied | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 0 104,000
Commercial real estate - mortgage | Owner-occupied | Current and Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,474,296,000 2,435,819,000
Commercial real estate - mortgage | All other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 4,519,749,000 4,209,595,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest [1] 2,274,000 704,000
Commercial real estate - mortgage | All other | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 11,539,000 12,018,000
Commercial real estate - mortgage | All other | Purchased credit impaired, nonaccruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest 2,971,000 2,860,000
Commercial real estate - mortgage | All other | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 7,017,000 16,559,000
Commercial real estate - mortgage | All other | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 7,017,000 16,559,000
Commercial real estate - mortgage | All other | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 0 0
Commercial real estate - mortgage | All other | Current and Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 4,495,948,000 4,177,454,000
Consumer real estate - mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,699,399,000 2,561,214,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest [1] 14,776,000 9,320,000
Consumer real estate - mortgage | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 4,285,000 5,249,000
Consumer real estate - mortgage | Purchased credit impaired, nonaccruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest 6,116,000 8,797,000
Consumer real estate - mortgage | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 14,093,000 16,100,000
Consumer real estate - mortgage | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 14,093,000 14,835,000
Consumer real estate - mortgage | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 0 1,265,000
Consumer real estate - mortgage | Current and Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,660,129,000 2,521,748,000
Construction and land development    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,133,646,000 1,908,288,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest [1] 662,000 2,878,000
Construction and land development | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 3,264,000 3,478,000
Construction and land development | Purchased credit impaired, nonaccruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest 1,366,000 3,090,000
Construction and land development | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,725,000 4,282,000
Construction and land development | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,725,000 4,136,000
Construction and land development | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 0 146,000
Construction and land development | Current and Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,125,629,000 1,894,560,000
Commercial and industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 4,821,299,000 4,141,341,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest [1] 16,767,000 17,222,000
Commercial and industrial | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 480,000 1,154,000
Commercial and industrial | Purchased credit impaired, nonaccruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest 51,000 84,000
Commercial and industrial | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 6,630,000 8,754,000
Commercial and industrial | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 5,755,000 7,406,000
Commercial and industrial | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 875,000 1,348,000
Commercial and industrial | Current and Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 4,797,371,000 4,114,127,000
Consumer and other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 363,870,000 352,663,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest [1] 863,000 0
Consumer and other | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 0 0
Consumer and other | Purchased credit impaired, nonaccruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest 1,000 0
Consumer and other | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 5,785,000 7,587,000
Consumer and other | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 5,088,000 6,311,000
Consumer and other | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 697,000 1,276,000
Consumer and other | Current and Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans $ 357,221,000 $ 345,076,000
[1] Approximately $54.4 million and $45.8 million of nonaccrual loans as of June 30, 2018 and December 31, 2017, respectively, were performing pursuant to their contractual terms at those dates.