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Purchased Credit Impaired ("PCI") Loans - Summary of PCI Loans by Category (Details) - Covered Loans $ in Thousands | Sep. 30, 2017 USD ($) rating | Dec. 31, 2016 USD ($) rating
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Covered Loans [Line Items] |  |
Recorded Investment PCI Loans | $ 81,982 | $ 39,769
Construction and land development |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 5.93 | 5.80
Recorded Investment PCI Loans | $ 7,927 | $ 4,365
Commercial Real Estate Investor Owned |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 7.29 | 6.95
Recorded Investment PCI Loans | $ 45,865 | $ 8,162
CRE - owner occupied |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.50 | 6.39
Recorded Investment PCI Loans | $ 11,786 | $ 11,863
Residential real estate |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.05 | 5.64
Recorded Investment PCI Loans | $ 12,661 | $ 11,792
Total real estate loans |  |
Covered Loans [Line Items] |  |
Recorded Investment PCI Loans | $ 78,239 | $ 36,182
Commercial and industrial |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.26 | 5.87
Recorded Investment PCI Loans | $ 3,676 | $ 3,523
Consumer and other |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 2.99 | 1.64
Recorded Investment PCI Loans | $ 67 | $ 64

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