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
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