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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.

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