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Portfolio Loans - Summary of Recorded Investment in Portfolio Loans by Class and Category Based on Impairment Method (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Loans - Ending balance: |  |  |  |
Loans, including unearned loan fees | $ 5,314,337 | $ 4,350,001 |  |
Non-Covered Loans |  |  |  |
Balance December 31, 2019 |  |  |  |
Individually evaluated for impairment | 2,567 | 4,453 |  |
Collectively evaluated for impairment | 40,000 | 37,842 |  |
Total | 42,567 | 42,295 | $ 38,166 | $ 37,565
Loans - Ending balance: |  |  |  |
Individually evaluated for impairment | 27,585 | 18,071 |  |
Collectively evaluated for impairment | 5,196,463 | 4,285,529 |  |
Loans, including unearned loan fees | 5,224,048 | 4,303,600 |  |
Total | 5,226,664 | 4,305,626 |  |
Non-Covered Loans | Commercial and industrial |  |  |  |
Balance December 31, 2019 |  |  |  |
Individually evaluated for impairment | 2,286 | 4,266 |  |
Collectively evaluated for impairment | 25,010 | 24,773 |  |
Total | 27,296 | 29,039 | 26,406 | 26,996
Loans - Ending balance: |  |  |  |
Individually evaluated for impairment | 22,578 | 12,950 |  |
Collectively evaluated for impairment | 2,323,245 | 2,108,058 |  |
Total | 2,345,823 | 2,121,008 |  |
Non-Covered Loans | CRE - investor owned |  |  |  |
Balance December 31, 2019 |  |  |  |
Individually evaluated for impairment | 247 | 0 |  |
Collectively evaluated for impairment | 5,688 | 4,683 |  |
Total | 5,935 | 4,683 | 3,890 | 3,420
Loans - Ending balance: |  |  |  |
Individually evaluated for impairment | 2,303 | 398 |  |
Collectively evaluated for impairment | 1,260,678 | 843,330 |  |
Total | 1,262,981 | 843,728 |  |
Non-Covered Loans | CRE - owner occupied |  |  |  |
Balance December 31, 2019 |  |  |  |
Individually evaluated for impairment | 0 | 109 |  |
Collectively evaluated for impairment | 4,873 | 4,130 |  |
Total | 4,873 | 4,239 | 3,308 | 2,890
Loans - Ending balance: |  |  |  |
Individually evaluated for impairment | 1,373 | 2,135 |  |
Collectively evaluated for impairment | 677,149 | 602,363 |  |
Total | 678,522 | 604,498 |  |
Non-Covered Loans | Construction and land development |  |  |  |
Balance December 31, 2019 |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 2,472 | 1,987 |  |
Total | 2,472 | 1,987 | 1,487 | 1,304
Loans - Ending balance: |  |  |  |
Individually evaluated for impairment | 0 | 0 |  |
Collectively evaluated for impairment | 449,380 | 330,097 |  |
Total | 449,380 | 330,097 |  |
Non-Covered Loans | Residential real estate |  |  |  |
Balance December 31, 2019 |  |  |  |
Individually evaluated for impairment | 33 | 52 |  |
Collectively evaluated for impairment | 1,247 | 1,564 |  |
Total | 1,280 | 1,616 | 2,237 | 2,023
Loans - Ending balance: |  |  |  |
Individually evaluated for impairment | 1,330 | 2,277 |  |
Collectively evaluated for impairment | 353,862 | 296,667 |  |
Total | 355,192 | 298,944 |  |
Non-Covered Loans | Consumer and other |  |  |  |
Balance December 31, 2019 |  |  |  |
Individually evaluated for impairment | 1 | 26 |  |
Collectively evaluated for impairment | 710 | 705 |  |
Total | 711 | 731 | $ 838 | $ 932
Loans - Ending balance: |  |  |  |
Individually evaluated for impairment | 1 | 311 |  |
Collectively evaluated for impairment | 132,149 | 105,014 |  |
Loans, including unearned loan fees | 132,150 | 105,325 |  |
Total | $ 134,766 | $ 107,351 |  |

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