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Purchased Credit Impaired ("PCI") Loans - Summary of PCI Loans by Category (Details) - Covered Loans $ in Thousands | Jun. 30, 2019 USD ($) rating | Dec. 31, 2018 USD ($) rating
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Covered Loans [Line Items] |  |
Recorded Investment PCI Loans | $ 103,315 | $ 46,401
Construction and land development |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 5.74 | 6.03
Recorded Investment PCI Loans | $ 8,187 | $ 4,548
CRE - investor owned |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.94 | 7.19
Recorded Investment PCI Loans | $ 41,988 | $ 23,939
CRE - owner occupied |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.68 | 7.39
Recorded Investment PCI Loans | $ 22,616 | $ 9,669
Residential real estate |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.29 | 6.40
Recorded Investment PCI Loans | $ 13,372 | $ 6,082
real estate financing receivable [Domain] |  |
Covered Loans [Line Items] |  |
Recorded Investment PCI Loans | $ 86,163 | $ 44,238
Commercial and industrial |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 5.80 | 6.09
Recorded Investment PCI Loans | $ 16,909 | $ 2,159
Consumer and other |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 5.11 | 2.18
Recorded Investment PCI Loans | $ 243 | $ 4

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