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Loans and Allowance for Loan Losses - Financing Receivables Past Due (Details) - USD ($) | Mar. 31, 2018 | Dec. 31, 2017
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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.

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