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Purchased Credit Impaired ("PCI") Loans - Summary of PCI Loans by Category (Details) - Covered Loans $ in Thousands | Dec. 31, 2019 USD ($) rating | Dec. 31, 2018 USD ($) rating
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Covered Loans [Line Items] |  |
Recorded Investment PCI Loans | $ 90,289 | $ 46,401
Commercial and industrial |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 5.65 | 6.09
Recorded Investment PCI Loans | $ 15,334 | $ 2,159
CRE - investor owned |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 7.02 | 7.19
Recorded Investment PCI Loans | $ 36,903 | $ 23,939
CRE - owner occupied |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.54 | 7.39
Recorded Investment PCI Loans | $ 18,915 | $ 9,669
Construction and land development |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 5.82 | 6.03
Recorded Investment PCI Loans | $ 7,893 | $ 4,548
Residential real estate |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.34 | 6.40
Recorded Investment PCI Loans | $ 11,069 | $ 6,082
Total real estate loans |  |
Covered Loans [Line Items] |  |
Recorded Investment PCI Loans | $ 74,780 | $ 44,238
Consumer and other |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 5.10 | 2.18
Recorded Investment PCI Loans | $ 175 | $ 4

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