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Portfolio Loans - Summary of Recorded Investment by Risk Category of Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, including unearned loan fees | $ 4,097,050 | $ 3,158,161
Non-Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 4,024,221 | 3,119,154
Loans, including unearned loan fees | 4,022,896 | 3,118,392
Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1,918,720 | 1,632,714
Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 769,275 | 544,808
Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 554,589 | 350,148
Non-Covered Loans | Construction and land development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 303,091 | 194,542
Non-Covered Loans | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 341,312 | 240,760
Non-Covered Loans | Consumer and other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 137,234 | 156,182
Loans, including unearned loan fees | 135,909 | 155,420
Pass (1-6) | Non-Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, including unearned loan fees | 3,794,940 | 2,909,234
Pass (1-6) | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 1,769,102 | 1,499,114
Pass (1-6) | Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 514,616 | 306,658
Pass (1-6) | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 754,010 | 530,494
Pass (1-6) | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 292,766 | 185,505
Pass (1-6) | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 329,742 | 233,479
Pass (1-6) | Non-Covered Loans | Consumer and other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, including unearned loan fees | 134,704 | 153,984
Watch (7) | Non-Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, including unearned loan fees | 152,923 | 116,686
Watch (7) | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 94,002 | 57,416
Watch (7) | Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 34,440 | 39,249
Watch (7) | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 10,840 | 10,449
Watch (7) | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 9,983 | 6,575
Watch (7) | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 3,648 | 2,997
Watch (7) | Non-Covered Loans | Consumer and other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, including unearned loan fees | 10 | 0
Substandard (8) | Non-Covered Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, including unearned loan fees | 75,033 | 92,472
Substandard (8) | Non-Covered Loans | Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 55,616 | 76,184
Substandard (8) | Non-Covered Loans | CRE - investor owned |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 5,533 | 4,241
Substandard (8) | Non-Covered Loans | CRE - owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 4,425 | 3,865
Substandard (8) | Non-Covered Loans | Construction and land development |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 342 | 2,462
Substandard (8) | Non-Covered Loans | Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total | 7,922 | 4,284
Substandard (8) | Non-Covered Loans | Consumer and other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans, including unearned loan fees | $ 1,195 | $ 1,436

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