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Loans and Allowance for Loan Losses - Financing Receivables Past Due (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | $ 18,174,906,000 | $ 17,707,549,000
Nonaccrual loans | [1] | 85,564,000 | 77,248,000
Currently performing impaired loans |  | 47,400,000 | 52,500,000
Purchased credit impaired, accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 13,122,000 | 14,743,000
Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Nonaccrual loans |  | 10,580,000 | 10,586,000
Past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 40,434,000 | 59,859,000
30-89 days past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 38,452,000 | 58,301,000
90 days or more past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 1,982,000 | 1,558,000
Current and Accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 18,025,206,000 | 17,545,113,000
Commercial Real Estate [Member] | Owner-occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  |  | 2,653,433,000
Nonaccrual loans | [1] |  | 16,025,000
Commercial Real Estate [Member] | Owner-occupied | Purchased credit impaired, accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  |  | 2,664,000
Commercial Real Estate [Member] | Owner-occupied | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Nonaccrual loans |  |  | 874,000
Commercial Real Estate [Member] | Owner-occupied | Past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  |  | 10,170,000
Commercial Real Estate [Member] | Owner-occupied | 30-89 days past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  |  | 10,170,000
Commercial Real Estate [Member] | Owner-occupied | 90 days or more past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  |  | 0
Commercial Real Estate [Member] | Owner-occupied | Current and Accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  |  | 2,623,700,000
Commercial Real Estate [Member] | All other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  |  | 4,511,521,000
Nonaccrual loans | [1] |  | 12,634,000
Commercial Real Estate [Member] | All other | Purchased credit impaired, accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  |  | 5,659,000
Commercial Real Estate [Member] | All other | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Nonaccrual loans |  |  | 2,802,000
Commercial Real Estate [Member] | All other | Past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  |  | 1,586,000
Commercial Real Estate [Member] | All other | 30-89 days past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  |  | 1,586,000
Commercial Real Estate [Member] | All other | 90 days or more past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  |  | 0
Commercial Real Estate [Member] | All other | Current and Accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  |  | 4,488,840,000
Residential Mortgage [Member] |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  |  | 2,844,447,000
Nonaccrual loans | [1] |  | 22,564,000
Residential Mortgage [Member] | Purchased credit impaired, accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  |  | 3,689,000
Residential Mortgage [Member] | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Nonaccrual loans |  |  | 5,505,000
Residential Mortgage [Member] | Past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  |  | 18,059,000
Residential Mortgage [Member] | 30-89 days past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  |  | 18,059,000
Residential Mortgage [Member] | 90 days or more past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  |  | 0
Residential Mortgage [Member] | Current and Accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  |  | 2,794,630,000
Commercial real estate - mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 7,419,146,000 | 7,164,954,000
Commercial real estate - mortgage | Owner-occupied |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 2,617,541,000 |
Nonaccrual loans | [1] | 22,436,000 |
Commercial real estate - mortgage | Owner-occupied | Purchased credit impaired, accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 2,577,000 |
Commercial real estate - mortgage | Owner-occupied | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Nonaccrual loans |  | 1,117,000 |
Commercial real estate - mortgage | Owner-occupied | Past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 8,302,000 |
Commercial real estate - mortgage | Owner-occupied | 30-89 days past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 8,302,000 |
Commercial real estate - mortgage | Owner-occupied | 90 days or more past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 0 |
Commercial real estate - mortgage | Owner-occupied | Current and Accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 2,583,109,000 |
Commercial real estate - mortgage | All other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 4,801,605,000 |
Nonaccrual loans | [1] | 12,601,000 |
Commercial real estate - mortgage | All other | Purchased credit impaired, accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 5,119,000 |
Commercial real estate - mortgage | All other | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Nonaccrual loans |  | 2,761,000 |
Commercial real estate - mortgage | All other | Past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 6,569,000 |
Commercial real estate - mortgage | All other | 30-89 days past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 6,569,000 |
Commercial real estate - mortgage | All other | 90 days or more past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 0 |
Commercial real estate - mortgage | All other | Current and Accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 4,774,555,000 |
Consumer real estate - mortgage |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 2,887,628,000 | 2,844,447,000
Nonaccrual loans | [1] | 27,336,000 |
Consumer real estate - mortgage | Purchased credit impaired, accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 3,683,000 |
Consumer real estate - mortgage | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Nonaccrual loans |  | 4,795,000 |
Consumer real estate - mortgage | Past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 11,021,000 |
Consumer real estate - mortgage | 30-89 days past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 10,982,000 |
Consumer real estate - mortgage | 90 days or more past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 39,000 |
Consumer real estate - mortgage | Current and Accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 2,840,793,000 |
Construction and land development |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 2,097,570,000 | 2,072,455,000
Nonaccrual loans | [1] | 868,000 | 2,020,000
Construction and land development | Purchased credit impaired, accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 1,437,000 | 2,108,000
Construction and land development | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Nonaccrual loans |  | 1,907,000 | 1,367,000
Construction and land development | Past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 795,000 | 3,759,000
Construction and land development | 30-89 days past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 795,000 | 3,759,000
Construction and land development | 90 days or more past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 0 | 0
Construction and land development | Current and Accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 2,092,563,000 | 2,063,201,000
Commercial and industrial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 5,419,520,000 | 5,271,421,000
Nonaccrual loans | [1] | 21,993,000 | 23,022,000
Commercial and industrial | Purchased credit impaired, accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 306,000 | 623,000
Commercial and industrial | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Nonaccrual loans |  | 0 | 38,000
Commercial and industrial | Past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 10,391,000 | 22,533,000
Commercial and industrial | 30-89 days past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 9,068,000 | 21,451,000
Commercial and industrial | 90 days or more past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 1,323,000 | 1,082,000
Commercial and industrial | Current and Accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 5,386,830,000 | 5,225,205,000
Consumer and other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 351,042,000 | 354,272,000
Nonaccrual loans | [1] | 330,000 | 983,000
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] |  |  |
Nonaccrual loans |  | 0 | 0
Consumer and other | Past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 3,356,000 | 3,752,000
Consumer and other | 30-89 days past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 2,736,000 | 3,276,000
Consumer and other | 90 days or more past due and accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | 620,000 | 476,000
Consumer and other | Current and Accruing |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Loans |  | $ 347,356,000 | $ 349,537,000
[1] | Approximately $47.4 million and $52.5 million of nonaccrual loans as of March 31, 2019 and December 31, 2018, respectively, were performing pursuant to their contractual terms at those dates.

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