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Purchased Credit Impaired ("PCI") Loans - Summary of PCI Loans by Category (Details) - Covered Loans $ in Thousands | Dec. 31, 2017 USD ($) rating | Dec. 31, 2016 USD ($) rating
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Covered Loans [Line Items] |  |
Recorded Investment PCI Loans | $ 74,154 | $ 39,769
Commercial and industrial |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.38 | 5.87
Recorded Investment PCI Loans | $ 3,212 | $ 3,523
CRE - investor owned |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 7.36 | 6.95
Recorded Investment PCI Loans | $ 42,887 | $ 8,162
CRE - owner occupied |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.48 | 6.39
Recorded Investment PCI Loans | $ 11,332 | $ 11,863
Construction and land development |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 5.99 | 5.80
Recorded Investment PCI Loans | $ 5,883 | $ 4,365
Residential real estate |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 5.99 | 5.64
Recorded Investment PCI Loans | $ 10,781 | $ 11,792
Total real estate loans |  |
Covered Loans [Line Items] |  |
Recorded Investment PCI Loans | $ 70,883 | $ 36,182
Consumer and other |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 2.84 | 1.64
Recorded Investment PCI Loans | $ 59 | $ 64

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