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Loans - Summary of Recorded Investment by Risk Category of Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross | $ 4,267,430 | $ 4,097,050
Non-Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 4,219,689 | 4,024,221
Loans and Leases Receivable, Gross | 4,218,341 | 4,022,896
Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 2,032,929 | 1,918,720
Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 826,447 | 769,275
Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 589,045 | 554,589
Non-Covered Loans | Construction and land development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 326,858 | 303,091
Non-Covered Loans | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 308,385 | 341,312
Non-Covered Loans | Consumer and other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 136,025 | 137,234
Loans and Leases Receivable, Gross | 134,677 | 135,909
Pass (1-6) | Non-Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 3,921,764 | 3,794,940
Pass (1-6) | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 1,835,230 | 1,769,102
Pass (1-6) | Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 798,116 | 754,010
Pass (1-6) | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 540,961 | 514,616
Pass (1-6) | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 315,022 | 292,766
Pass (1-6) | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 298,076 | 329,742
Pass (1-6) | Non-Covered Loans | Consumer and other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 134,359 | 134,704
Watch (7) | Non-Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 223,282 | 152,923
Watch (7) | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 142,768 | 94,002
Watch (7) | Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 22,275 | 10,840
Watch (7) | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 43,399 | 34,440
Watch (7) | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 11,775 | 9,983
Watch (7) | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 3,058 | 3,648
Watch (7) | Non-Covered Loans | Consumer and other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 7 | 10
Classified (8 & 9) | Non-Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 73,295 | 75,033
Classified (8 & 9) | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 54,931 | 55,616
Classified (8 & 9) | Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 6,056 | 4,425
Classified (8 & 9) | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 4,685 | 5,533
Classified (8 & 9) | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 61 | 342
Classified (8 & 9) | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 7,251 | 7,922
Classified (8 & 9) | Non-Covered Loans | Consumer and other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | $ 311 | $ 1,195

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