Purchase Credit Impaired ("PCI") Loans - Summary of PCI Loans by Category (Details) - Covered Loans $ in Thousands	Dec. 31, 2015 USD ($) rating	Dec. 31, 2014 USD ($) rating
Covered Loans [Line Items]
Recorded Investment PCI Loans	$ 74,758	$ 99,103
Construction and land development
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.28	6.16
Recorded Investment PCI Loans	$ 6,838	$ 7,740
CRE - owner occupied
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.98	7.07
Recorded Investment PCI Loans	$ 25,272	$ 39,066
CRE - investor owned
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.30	6.35
Recorded Investment PCI Loans	$ 19,414	$ 22,695
Residential real estate
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	5.44	5.54
Recorded Investment PCI Loans	$ 19,287	$ 25,121
Total real estate loans
Covered Loans [Line Items]
Recorded Investment PCI Loans	$ 70,811	$ 94,622
Commercial and industrial
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.70	6.57
Recorded Investment PCI Loans	$ 3,863	$ 4,012
Consumer and other
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	1.89	5.39
Recorded Investment PCI Loans	$ 84	$ 469