Purchased Credit Impaired ("PCI") Loans - Summary of Aging of Recorded Investment in Past Due PCI Loans by Portfolio Class and Category (Details) - Covered Loans - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	$ 1,118	$ 4,671
90 or More Days Past Due	55	3,791
Total Past Due	1,173	8,462
Current	46,276	66,296
Total	47,449	74,758
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	805	0
90 or More Days Past Due	0	0
Total Past Due	805	0
Current	2,477	3,863
Total	3,282	3,863
CRE - owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	229	731
90 or More Days Past Due	0	0
Total Past Due	229	731
Current	12,188	18,683
Total	12,417	19,414
Commercial Real Estate Investor Owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	2,342
90 or More Days Past Due	0	3,661
Total Past Due	0	6,003
Current	14,595	19,269
Total	14,595	25,272
Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	0
90 or More Days Past Due	0	0
Total Past Due	0	0
Current	4,919	6,838
Total	4,919	6,838
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	84	1,594
90 or More Days Past Due	55	130
Total Past Due	139	1,724
Current	12,034	17,563
Total	12,173	19,287
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	4
90 or More Days Past Due	0	0
Total Past Due	0	4
Current	63	80
Total	$ 63	$ 84