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Purchased Credit Impaired ("PCI") Loans - Summary of PCI Loans by Category (Details) - Covered Loans $ in Thousands | Sep. 30, 2019 USD ($) rating | Dec. 31, 2018 USD ($) rating
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Covered Loans [Line Items] |  |
Recorded Investment PCI Loans | $ 95,623 | $ 46,401
Construction and land development |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 5.75 | 6.03
Recorded Investment PCI Loans | $ 7,847 | $ 4,548
CRE - investor owned |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 7.04 | 7.19
Recorded Investment PCI Loans | $ 39,329 | $ 23,939
CRE - owner occupied |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.58 | 7.39
Recorded Investment PCI Loans | $ 20,435 | $ 9,669
Residential real estate |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.31 | 6.40
Recorded Investment PCI Loans | $ 12,011 | $ 6,082
real estate financing receivable [Domain] |  |
Covered Loans [Line Items] |  |
Recorded Investment PCI Loans | $ 79,622 | $ 44,238
Commercial and industrial |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 5.77 | 6.09
Recorded Investment PCI Loans | $ 15,773 | $ 2,159
Consumer and other |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 5.54 | 2.18
Recorded Investment PCI Loans | $ 228 | $ 4

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