Purchased 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	$ 47,449	$ 74,758
Construction and land development
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	5.67	6.28
Recorded Investment PCI Loans	$ 4,919	$ 6,838
Commercial Real Estate Investor Owned
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.94	6.98
Recorded Investment PCI Loans	$ 14,595	$ 25,272
CRE - owner occupied
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.34	6.30
Recorded Investment PCI Loans	$ 12,417	$ 19,414
Residential real estate
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	5.66	5.44
Recorded Investment PCI Loans	$ 12,173	$ 19,287
Total real estate loans
Covered Loans [Line Items]
Recorded Investment PCI Loans	$ 44,104	$ 70,811
Commercial and industrial
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	5.84	6.70
Recorded Investment PCI Loans	$ 3,282	$ 3,863
Consumer and other
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	1.54	1.89
Recorded Investment PCI Loans	$ 63	$ 84