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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, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross | $ 4,030,658 | $ 3,158,161
Non-Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 3,949,856 | 3,119,154
Loans and Leases Receivable, Gross | 3,948,676 | 3,118,392
Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 1,861,285 | 1,632,714
Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 553,512 | 350,148
Non-Covered Loans | Commercial Real Estate Investor Owned |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 737,986 | 544,808
Non-Covered Loans | Construction and land development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 302,182 | 194,542
Non-Covered Loans | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 339,377 | 240,760
Non-Covered Loans | Consumer and other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 155,514 | 156,182
Loans and Leases Receivable, Gross | 154,334 | 155,420
Pass (1-6) | Non-Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 3,723,164 | 2,909,234
Pass (1-6) | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 1,708,153 | 1,499,114
Pass (1-6) | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 513,939 | 306,658
Pass (1-6) | Non-Covered Loans | Commercial Real Estate Investor Owned |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 720,912 | 530,494
Pass (1-6) | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 298,613 | 185,505
Pass (1-6) | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 328,434 | 233,479
Pass (1-6) | Non-Covered Loans | Consumer and other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 153,113 | 153,984
Watch (7) | Non-Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 143,648 | 116,686
Watch (7) | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 90,885 | 57,416
Watch (7) | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 33,249 | 39,249
Watch (7) | Non-Covered Loans | Commercial Real Estate Investor Owned |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 12,592 | 10,449
Watch (7) | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 2,558 | 6,575
Watch (7) | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 3,989 | 2,997
Watch (7) | Non-Covered Loans | Consumer and other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 375 | 0
Substandard (8) | Non-Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 81,864 | 92,472
Substandard (8) | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 62,247 | 76,184
Substandard (8) | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 6,324 | 4,241
Substandard (8) | Non-Covered Loans | Commercial Real Estate Investor Owned |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 4,482 | 3,865
Substandard (8) | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 1,011 | 2,462
Substandard (8) | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 6,954 | 4,284
Substandard (8) | Non-Covered Loans | Consumer and other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 846 | 1,436
Doubtful (9) | Non-Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 0 | 0
Doubtful (9) | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 0 | 0
Doubtful (9) | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 0 | 0
Doubtful (9) | Non-Covered Loans | Commercial Real Estate Investor Owned |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 0 | 0
Doubtful (9) | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 0 | 0
Doubtful (9) | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | 0 | 0
Doubtful (9) | Non-Covered Loans | Consumer and other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, before unearned loan fees | $ 0 | $ 0

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