Purchase 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	$ 394	$ 4,671
90 or More Days Past Due	144	3,791
Total Past Due	538	8,462
Current	55,991	66,296
Total	56,529	74,758
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	22	0
90 or More Days Past Due	0	0
Total Past Due	22	0
Current	3,476	3,863
Total	3,498	3,863
CRE - owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	731
90 or More Days Past Due	0	0
Total Past Due	0	731
Current	13,068	18,683
Total	13,068	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	19,328	19,269
Total	19,328	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	5,523	6,838
Total	5,523	6,838
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	372	1,594
90 or More Days Past Due	144	130
Total Past Due	516	1,724
Current	14,531	17,563
Total	15,047	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	65	80
Total	$ 65	$ 84