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Purchased Credit Impaired ("PCI") Loans - Summary of PCI Loans by Category (Details) - Covered Loans $ in Thousands | Mar. 31, 2019 USD ($) rating | Dec. 31, 2018 USD ($) rating
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Covered Loans [Line Items] |  |
Recorded Investment PCI Loans | $ 122,503 | $ 46,401
Construction and land development |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.16 | 6.03
Recorded Investment PCI Loans | $ 10,481 | $ 4,548
CRE - investor owned |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.68 | 7.19
Recorded Investment PCI Loans | $ 42,948 | $ 23,939
CRE - owner occupied |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.81 | 7.39
Recorded Investment PCI Loans | $ 35,026 | $ 9,669
Residential real estate |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.20 | 6.40
Recorded Investment PCI Loans | $ 16,171 | $ 6,082
real estate financing receivable [Domain] |  |
Covered Loans [Line Items] |  |
Recorded Investment PCI Loans | $ 122,239 | $ 46,397
Commercial and industrial |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 4.75 | 6.09
Recorded Investment PCI Loans | $ 17,613 | $ 2,159
Consumer and other |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 3.58 | 2.18
Recorded Investment PCI Loans | $ 264 | $ 4

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