Purchased Credit Impaired ("PCI") Loans - Summary of PCI Loans by Category (Details) - Covered Loans $ in Thousands	Jun. 30, 2017 USD ($) rating	Dec. 31, 2016 USD ($) rating
Covered Loans [Line Items]
Recorded Investment PCI Loans	$ 84,300	$ 39,769
Construction and land development
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	5.84	5.80
Recorded Investment PCI Loans	$ 7,883	$ 4,365
Commercial Real Estate Investor Owned
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	7.35	6.95
Recorded Investment PCI Loans	$ 46,180	$ 8,162
CRE - owner occupied
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.55	6.39
Recorded Investment PCI Loans	$ 12,743	$ 11,863
Residential real estate
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.15	5.64
Recorded Investment PCI Loans	$ 13,370	$ 11,792
Total real estate loans
Covered Loans [Line Items]
Recorded Investment PCI Loans	$ 80,176	$ 36,182
Commercial and industrial
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	6.02	5.87
Recorded Investment PCI Loans	$ 4,059	$ 3,523
Consumer and other
Covered Loans [Line Items]
Weighted- Average Risk Rating1 | rating	2.81	1.64
Recorded Investment PCI Loans	$ 65	$ 64