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Loans and Allowance for Loan Losses, Financing Receivables Past Due (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | $ 17,707,549,000 | $ 15,633,116,000 | $ 8,449,925,000
Nonaccrual loans | [1] | 77,248,000 | 41,519,000 |
Total Loans |  | 17,707,549,000 | 15,633,116,000 |
Currently performing impaired loans |  | 52,500,000 | 45,800,000 |
Purchase credit impaired, accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 14,743,000 | 26,719,000 |
Purchase credit impaired, nonaccruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Nonaccrual loans |  | 10,586,000 | 15,936,000 |
Financing Receivables 30 To 89 Days Past Due and Still Accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 58,301,000 | 56,019,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 1,558,000 | 4,139,000 |
Current and accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 17,545,113,000 | 15,488,784,000 |
Commercial Real Estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 7,164,954,000 | 6,669,610,000 | 3,193,496,000
Commercial Real Estate | Commercial Real Estate Owner Occupied |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Nonaccrual loans | [1] | 16,025,000 | 11,395,000 |
Total Loans |  | 2,653,433,000 | 2,460,015,000 |
Commercial Real Estate | Commercial Real Estate Owner Occupied | Purchase credit impaired, accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 2,664,000 | 4,820,000 |
Commercial Real Estate | Commercial Real Estate Owner Occupied | Purchase credit impaired, nonaccruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Nonaccrual loans |  | 874,000 | 1,105,000 |
Commercial Real Estate | Commercial Real Estate Owner Occupied | Financing Receivables 30 To 89 Days Past Due and Still Accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 10,170,000 | 6,772,000 |
Commercial Real Estate | Commercial Real Estate Owner Occupied | Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 0 | 104,000 |
Commercial Real Estate | Commercial Real Estate Owner Occupied | Current and accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 2,623,700,000 | 2,435,819,000 |
Commercial Real Estate | Commercial Real Estate All Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Nonaccrual loans | [1] | 12,634,000 | 704,000 |
Total Loans |  | 4,511,521,000 | 4,209,595,000 |
Commercial Real Estate | Commercial Real Estate All Other | Purchase credit impaired, accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 5,659,000 | 12,018,000 |
Commercial Real Estate | Commercial Real Estate All Other | Purchase credit impaired, nonaccruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Nonaccrual loans |  | 2,802,000 | 2,860,000 |
Commercial Real Estate | Commercial Real Estate All Other | Financing Receivables 30 To 89 Days Past Due and Still Accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 1,586,000 | 16,559,000 |
Commercial Real Estate | Commercial Real Estate All Other | Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 0 | 0 |
Commercial Real Estate | Commercial Real Estate All Other | Current and accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 4,488,840,000 | 4,177,454,000 |
Consumer Real Estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 2,844,447,000 | 2,561,214,000 | 1,185,917,000
Nonaccrual loans | [1] | 22,564,000 | 9,320,000 |
Total Loans |  | 2,844,447,000 | 2,561,214,000 |
Consumer Real Estate | Purchase credit impaired, accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 3,689,000 | 5,249,000 |
Consumer Real Estate | Purchase credit impaired, nonaccruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Nonaccrual loans |  | 5,505,000 | 8,797,000 |
Consumer Real Estate | Financing Receivables 30 To 89 Days Past Due and Still Accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 18,059,000 | 14,835,000 |
Consumer Real Estate | Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 0 | 1,265,000 |
Consumer Real Estate | Current and accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 2,794,630,000 | 2,521,748,000 |
Construction and Land Development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 2,072,455,000 | 1,908,288,000 | 912,673,000
Nonaccrual loans | [1] | 2,020,000 | 2,878,000 |
Total Loans |  | 2,072,455,000 | 1,908,288,000 |
Construction and Land Development | Purchase credit impaired, accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 2,108,000 | 3,478,000 |
Construction and Land Development | Purchase credit impaired, nonaccruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Nonaccrual loans |  | 1,367,000 | 3,090,000 |
Construction and Land Development | Financing Receivables 30 To 89 Days Past Due and Still Accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 3,759,000 | 4,136,000 |
Construction and Land Development | Financing Receivables, Equal to Greater than 90 Days Past Due and Still 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 |  | 2,063,201,000 | 1,894,560,000 |
Commercial and Industrial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 5,271,421,000 | 4,141,341,000 | 2,891,710,000
Nonaccrual loans | [1] | 23,022,000 | 17,222,000 |
Total Loans |  | 5,271,421,000 | 4,141,341,000 |
Commercial and Industrial | Purchase credit impaired, accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 623,000 | 1,154,000 |
Commercial and Industrial | Purchase credit impaired, nonaccruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Nonaccrual loans |  | 38,000 | 84,000 |
Commercial and Industrial | Financing Receivables 30 To 89 Days Past Due and Still Accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 21,451,000 | 7,406,000 |
Commercial and Industrial | Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 1,082,000 | 1,348,000 |
Commercial and Industrial | Current and accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 5,225,205,000 | 4,114,127,000 |
Consumer and Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 354,272,000 | 352,663,000 | $ 266,129,000
Nonaccrual loans | [1] | 983,000 | 0 |
Total Loans |  | 354,272,000 | 352,663,000 |
Consumer and Other | Purchase credit impaired, accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 0 | 0 |
Consumer and Other | Purchase credit impaired, nonaccruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Nonaccrual loans |  | 0 | 0 |
Consumer and Other | Financing Receivables 30 To 89 Days Past Due and Still Accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 3,276,000 | 6,311,000 |
Consumer and Other | Financing Receivables, Equal to Greater than 90 Days Past Due and Still Accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | 476,000 | 1,276,000 |
Consumer and Other | Current and accruing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Loans |  | $ 349,537,000 | $ 345,076,000 |
[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.

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