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Purchase Credit Impaired ("PCI") Loans - Summary of PCI Loans by Category (Details) - Covered Loans $ in Thousands | Jun. 30, 2016 USD ($) rating | Dec. 31, 2015 USD ($) rating
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Covered Loans [Line Items] |  |
Recorded Investment PCI Loans | $ 56,529 | $ 74,758
Construction and land development |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 5.70 | 6.28
Recorded Investment PCI Loans | $ 5,523 | $ 6,838
Commercial Real Estate Investor Owned |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 7.14 | 6.98
Recorded Investment PCI Loans | $ 19,328 | $ 25,272
CRE - owner occupied |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.35 | 6.30
Recorded Investment PCI Loans | $ 13,068 | $ 19,414
Residential real estate |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 5.44 | 5.44
Recorded Investment PCI Loans | $ 15,047 | $ 19,287
Total real estate loans |  |
Covered Loans [Line Items] |  |
Recorded Investment PCI Loans | $ 52,966 | $ 70,811
Commercial and industrial |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 6.45 | 6.70
Recorded Investment PCI Loans | $ 3,498 | $ 3,863
Consumer and other |  |
Covered Loans [Line Items] |  |
Weighted- Average Risk Rating1 | rating | 1.60 | 1.89
Recorded Investment PCI Loans | $ 65 | $ 84

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