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Loans - Summary of Recorded Investment by Risk Category of Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross | $ 5,017,077 | $ 4,350,001
Non-Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 4,896,486 | 4,305,626
Loans and Leases Receivable, Gross | 4,894,574 | 4,303,600
Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 2,209,437 | 2,121,008
Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 1,144,868 | 843,728
Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 647,198 | 604,498
Non-Covered Loans | Construction and land development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 358,884 | 330,097
Non-Covered Loans | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 416,731 | 298,944
Non-Covered Loans | Consumer and other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 119,368 | 107,351
Loans and Leases Receivable, Gross | 117,456 | 105,325
Pass (1-6) | Non-Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 4,605,414 | 4,025,173
Pass (1-6) | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 1,991,293 | 1,927,782
Pass (1-6) | Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 1,124,030 | 823,128
Pass (1-6) | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 608,773 | 563,003
Pass (1-6) | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 354,835 | 318,451
Pass (1-6) | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 409,032 | 287,802
Pass (1-6) | Non-Covered Loans | Consumer and other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 117,451 | 105,007
Watch (7) | Non-Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 216,533 | 208,768
Watch (7) | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 157,408 | 146,033
Watch (7) | Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 17,088 | 15,083
Watch (7) | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 36,052 | 31,834
Watch (7) | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 3,984 | 11,580
Watch (7) | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 1,996 | 4,232
Watch (7) | Non-Covered Loans | Consumer and other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 5 | 6
Classified (8 & 9) | Non-Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 72,627 | 69,659
Classified (8 & 9) | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 60,736 | 47,193
Classified (8 & 9) | Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 3,750 | 5,517
Classified (8 & 9) | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 2,373 | 9,661
Classified (8 & 9) | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 65 | 66
Classified (8 & 9) | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 5,703 | 6,910
Classified (8 & 9) | Non-Covered Loans | Consumer and other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | $ 0 | $ 312

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