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Purchased Credit Impaired ("PCI") Loans - Summary of PCI Loans by Category (Details) - Covered Loans $ in Thousands | Jun. 30, 2017 USD ($) rating | Dec. 31, 2016 USD ($) rating
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Covered Loans [Line Items] |  |
Recorded Investment PCI Loans | $ 84,300 | $ 39,769
Construction and land development |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 5.84 | 5.80
Recorded Investment PCI Loans | $ 7,883 | $ 4,365
Commercial Real Estate Investor Owned |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 7.35 | 6.95
Recorded Investment PCI Loans | $ 46,180 | $ 8,162
CRE - owner occupied |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.55 | 6.39
Recorded Investment PCI Loans | $ 12,743 | $ 11,863
Residential real estate |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.15 | 5.64
Recorded Investment PCI Loans | $ 13,370 | $ 11,792
Total real estate loans |  |
Covered Loans [Line Items] |  |
Recorded Investment PCI Loans | $ 80,176 | $ 36,182
Commercial and industrial |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.02 | 5.87
Recorded Investment PCI Loans | $ 4,059 | $ 3,523
Consumer and other |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 2.81 | 1.64
Recorded Investment PCI Loans | $ 65 | $ 64

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