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Purchased Credit Impaired ("PCI") Loans - Summary of PCI Loans by Category (Details) - Covered Loans $ in Thousands	Dec. 31, 2016 USD ($) rating	Dec. 31, 2015 USD ($) rating
Covered Loans [Line Items]
Recorded Investment PCI Loans	$ 39,769	$ 74,758
Commercial and industrial
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	5.87	6.70
Recorded Investment PCI Loans	$ 3,523	$ 3,863
CRE - investor owned
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.95	6.98
Recorded Investment PCI Loans	$ 8,162	$ 25,272
CRE - owner occupied
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.39	6.30
Recorded Investment PCI Loans	$ 11,863	$ 19,414
Construction and land development
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	5.80	6.28
Recorded Investment PCI Loans	$ 4,365	$ 6,838
Residential real estate
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	5.64	5.44
Recorded Investment PCI Loans	$ 11,792	$ 19,287
Total real estate loans
Covered Loans [Line Items]
Recorded Investment PCI Loans	$ 36,182	$ 70,811
Consumer and other
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	1.64	1.89
Recorded Investment PCI Loans	$ 64	$ 84

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- Definition

Covered Loans [Line Items]

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- Definition

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