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Loans and Allowance for Loan Losses - Financing Receivables Past Due (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | $ 19,345,642 | $ 17,707,549
Nonaccrual loans | [1] | 65,278 | 77,248
Currently performing impaired loans |  | 33,500 | 52,500
Purchased credit impaired, accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 12,887 | 14,743
Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | [1] | 7,985 | 10,586
Past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 45,590 | 59,859
30-89 days past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 43,140 | 58,301
90 days or more past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 2,450 | 1,558
Current and Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 19,213,902 | 17,545,113
Commercial real estate - mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 7,709,245 | 7,164,954
Commercial real estate - mortgage | Owner-occupied |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 2,595,837 | 2,653,433
Nonaccrual loans | [1] | 11,011 | 16,025
Commercial real estate - mortgage | Owner-occupied | Purchased credit impaired, accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 2,903 | 2,664
Commercial real estate - mortgage | Owner-occupied | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | [1] | 897 | 874
Commercial real estate - mortgage | Owner-occupied | Past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 6,398 | 10,170
Commercial real estate - mortgage | Owner-occupied | 30-89 days past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 6,398 | 10,170
Commercial real estate - mortgage | Owner-occupied | 90 days or more past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 0 | 0
Commercial real estate - mortgage | Owner-occupied | Current and Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 2,574,628 | 2,623,700
Commercial real estate - mortgage | All other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 5,113,408 | 4,511,521
Nonaccrual loans | [1] | 10,640 | 12,634
Commercial real estate - mortgage | All other | Purchased credit impaired, accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 5,169 | 5,659
Commercial real estate - mortgage | All other | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | [1] | 43 | 2,802
Commercial real estate - mortgage | All other | Past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 5,896 | 1,586
Commercial real estate - mortgage | All other | 30-89 days past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 5,896 | 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 |  | 5,091,660 | 4,488,840
Consumer real estate - mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 3,025,502 | 2,844,447
Nonaccrual loans | [1] | 19,245 | 22,564
Consumer real estate - mortgage | Purchased credit impaired, accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 3,216 | 3,689
Consumer real estate - mortgage | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | [1] | 3,844 | 5,505
Consumer real estate - mortgage | Past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 9,824 | 18,059
Consumer real estate - mortgage | 30-89 days past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 9,051 | 18,059
Consumer real estate - mortgage | 90 days or more past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 773 | 0
Consumer real estate - mortgage | Current and Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 2,989,373 | 2,794,630
Construction and land development |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 2,253,303 | 2,072,455
Nonaccrual loans | [1] | 275 | 2,020
Construction and land development | Purchased credit impaired, accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 1,274 | 2,108
Construction and land development | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | [1] | 1,772 | 1,367
Construction and land development | Past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 2,005 | 3,759
Construction and land development | 30-89 days past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 2,005 | 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 |  | 2,247,977 | 2,063,201
Commercial and industrial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 5,891,038 | 5,271,421
Nonaccrual loans | [1] | 23,931 | 23,022
Commercial and industrial | Purchased credit impaired, accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 325 | 623
Commercial and industrial | Purchased credit impaired, nonaccruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Nonaccrual loans | [1] | 1,429 | 38
Commercial and industrial | Past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 17,601 | 22,533
Commercial and industrial | 30-89 days past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 16,524 | 21,451
Commercial and industrial | 90 days or more past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 1,077 | 1,082
Commercial and industrial | Current and Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 5,847,752 | 5,225,205
Consumer and other |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 466,554 | 354,272
Nonaccrual loans | [1] | 176 | 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 |  | 3,866 | 3,752
Consumer and other | 30-89 days past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 3,266 | 3,276
Consumer and other | 90 days or more past due and accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | 600 | 476
Consumer and other | Current and Accruing |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans |  | $ 462,512 | $ 349,537
[1] | Approximately $33.5 million and $52.5 million of nonaccrual loans as of September 30, 2019 and December 31, 2018, respectively, were performing pursuant to their contractual terms at those dates.

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