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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
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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- Definition

Covered Loans [Line Items]

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- Definition

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