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Loans and Allowance for Loan Losses - Financing Receivables Past Due (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans $ 16,326,017,000 $ 15,633,116,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest [1] 55,729,000 41,519,000
Currently performing impaired loans 56,300,000 45,800,000
Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 24,398,000 26,719,000
Purchased credit impaired, nonaccruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest 14,473,000 15,936,000
Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 39,665,000 60,158,000
30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 38,534,000 56,019,000
90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 1,131,000 4,139,000
Purchase credit impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 16,191,752,000 15,488,784,000
Commercial real estate - mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 6,794,288,000 6,669,610,000
Commercial real estate - mortgage | Owner-occupied    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,427,946,000 2,460,015,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest [1] 19,935,000 11,395,000
Commercial real estate - mortgage | Owner-occupied | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 4,430,000 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 1,172,000 1,105,000
Commercial real estate - mortgage | Owner-occupied | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 3,810,000 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 3,805,000 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 5,000 104,000
Commercial real estate - mortgage | Owner-occupied | Purchase credit impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,398,599,000 2,435,819,000
Commercial real estate - mortgage | All other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 4,366,342,000 4,209,595,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest [1] 1,206,000 704,000
Commercial real estate - mortgage | All other | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 11,903,000 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 2,787,000 2,860,000
Commercial real estate - mortgage | All other | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 6,810,000 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 6,678,000 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 132,000 0
Commercial real estate - mortgage | All other | Purchase credit impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 4,343,636,000 4,177,454,000
Consumer real estate - mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,580,766,000 2,561,214,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest [1] 11,336,000 9,320,000
Consumer real estate - mortgage | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 4,024,000 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 7,195,000 8,797,000
Consumer real estate - mortgage | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 13,386,000 16,100,000
Consumer real estate - mortgage | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 13,367,000 14,835,000
Consumer real estate - mortgage | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 19,000 1,265,000
Consumer real estate - mortgage | Purchase credit impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,544,825,000 2,521,748,000
Construction and land development    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,095,875,000 1,908,288,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest [1] 381,000 2,878,000
Construction and land development | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 3,339,000 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 3,236,000 3,090,000
Construction and land development | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 609,000 4,282,000
Construction and land development | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 606,000 4,136,000
Construction and land development | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 3,000 146,000
Construction and land development | Purchase credit impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 2,088,310,000 1,894,560,000
Commercial and industrial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 4,490,886,000 4,141,341,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest [1] 22,090,000 17,222,000
Commercial and industrial | Purchased credit impaired, accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 702,000 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 82,000 84,000
Commercial and industrial | Past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 9,851,000 8,754,000
Commercial and industrial | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 9,262,000 7,406,000
Commercial and industrial | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 589,000 1,348,000
Commercial and industrial | Purchase credit impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 4,458,161,000 4,114,127,000
Consumer and other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 364,202,000 352,663,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest [1] 781,000 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 5,199,000 7,587,000
Consumer and other | 30-89 days past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 4,816,000 6,311,000
Consumer and other | 90 days or more past due and accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans 383,000 1,276,000
Consumer and other | Purchase credit impaired    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans $ 358,221,000 $ 345,076,000
[1] Approximately $56.3 million and $45.8 million of nonaccrual loans as of March 31, 2018 and December 31, 2017, respectively, were performing pursuant to their contractual terms at those dates.