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Loans and Allowance for Loan Losses - Financing Receivables Past Due (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | $ 18,814,318 | $ 17,707,549
Nonaccrual loans | [1] | 68,904 | 77,248
Currently performing impaired loans |  | 34,800 | 52,500
Purchased credit impaired, accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 12,632 | 14,743
Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | [1] | 7,173 | 10,586
Past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 39,987 | 59,859
30-89 days past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 37,254 | 58,301
90 days or more past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 2,733 | 1,558
Current and Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 18,685,622 | 17,545,113
Commercial real estate - mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 7,585,393 | 7,164,954
Commercial real estate - mortgage | Owner-occupied |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 2,624,160 | 2,653,433
Nonaccrual loans | [1] | 11,976 | 16,025
Commercial real estate - mortgage | Owner-occupied | Purchased credit impaired, accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 2,450 | 2,664
Commercial real estate - mortgage | Owner-occupied | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | [1] | 970 | 874
Commercial real estate - mortgage | Owner-occupied | Past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 2,443 | 10,170
Commercial real estate - mortgage | Owner-occupied | 30-89 days past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 2,373 | 10,170
Commercial real estate - mortgage | Owner-occupied | 90 days or more past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 70 | 0
Commercial real estate - mortgage | Owner-occupied | Current and Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 2,606,321 | 2,623,700
Commercial real estate - mortgage | All other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 4,961,233 | 4,511,521
Nonaccrual loans | [1] | 10,828 | 12,634
Commercial real estate - mortgage | All other | Purchased credit impaired, accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 5,070 | 5,659
Commercial real estate - mortgage | All other | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | [1] | 17 | 2,802
Commercial real estate - mortgage | All other | Past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 4,731 | 1,586
Commercial real estate - mortgage | All other | 30-89 days past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 4,731 | 1,586
Commercial real estate - mortgage | All other | 90 days or more past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 0 | 0
Commercial real estate - mortgage | All other | Current and Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 4,940,587 | 4,488,840
Consumer real estate - mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 2,949,755 | 2,844,447
Nonaccrual loans | [1] | 25,501 | 22,564
Consumer real estate - mortgage | Purchased credit impaired, accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 3,406 | 3,689
Consumer real estate - mortgage | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | [1] | 4,396 | 5,505
Consumer real estate - mortgage | Past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 10,823 | 18,059
Consumer real estate - mortgage | 30-89 days past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 10,603 | 18,059
Consumer real estate - mortgage | 90 days or more past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 220 | 0
Consumer real estate - mortgage | Current and Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 2,905,629 | 2,794,630
Construction and land development |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 2,117,969 | 2,072,455
Nonaccrual loans | [1] | 605 | 2,020
Construction and land development | Purchased credit impaired, accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 1,421 | 2,108
Construction and land development | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | [1] | 1,790 | 1,367
Construction and land development | Past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 3,469 | 3,759
Construction and land development | 30-89 days past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 3,469 | 3,759
Construction and land development | 90 days or more past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 0 | 0
Construction and land development | Current and Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 2,110,684 | 2,063,201
Commercial and industrial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 5,795,107 | 5,271,421
Nonaccrual loans | [1] | 19,883 | 23,022
Commercial and industrial | Purchased credit impaired, accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 285 | 623
Commercial and industrial | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | [1] | 0 | 38
Commercial and industrial | Past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 12,957 | 22,533
Commercial and industrial | 30-89 days past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 11,420 | 21,451
Commercial and industrial | 90 days or more past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 1,537 | 1,082
Commercial and industrial | Current and Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 5,761,982 | 5,225,205
Consumer and other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 366,094 | 354,272
Nonaccrual loans | [1] | 111 | 983
Consumer and other | Purchased credit impaired, accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 0 | 0
Consumer and other | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | [1] | 0 | 0
Consumer and other | Past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 5,564 | 3,752
Consumer and other | 30-89 days past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 4,658 | 3,276
Consumer and other | 90 days or more past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 906 | 476
Consumer and other | Current and Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | $ 360,419 | $ 349,537
[1] | Approximately $34.8 million and $52.5 million of nonaccrual loans as of June 30, 2019 and December 31, 2018, respectively, were performing pursuant to their contractual terms at those dates.

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