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Purchased Credit Impaired ("PCI") Loans - Summary of PCI Loans by Category (Details) - Covered Loans $ in Thousands | Sep. 30, 2018 USD ($) rating | Dec. 31, 2017 USD ($) rating
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Covered Loans [Line Items] |  |
Recorded Investment PCI Loans | $ 49,089 | $ 74,154
Construction and land development |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.01 | 5.99
Recorded Investment PCI Loans | $ 5,168 | $ 5,883
CRE - investor owned |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 7.23 | 7.36
Recorded Investment PCI Loans | $ 25,172 | $ 42,887
CRE - owner occupied |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 7.45 | 6.48
Recorded Investment PCI Loans | $ 9,520 | $ 11,332
Residential real estate |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.35 | 5.99
Recorded Investment PCI Loans | $ 6,291 | $ 10,781
Commercial and industrial |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.39 | 6.38
Recorded Investment PCI Loans | $ 2,923 | $ 3,212
Consumer and other |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 7.08 | 2.84
Recorded Investment PCI Loans | $ 15 | $ 59

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