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	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	$ 4,671	$ 3,672
90 or More Days Past Due	3,791	10,722
Total Past Due	8,462	14,394
Current	66,296	84,709
Total	74,758	99,103
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	0
90 or More Days Past Due	0	16
Total Past Due	0	16
Current	3,863	3,996
Total	3,863	4,012
CRE - investor owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	731	0
90 or More Days Past Due	0	2,759
Total Past Due	731	2,759
Current	18,683	19,936
Total	19,414	22,695
CRE - owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	2,342	878
90 or More Days Past Due	3,661	6,484
Total Past Due	6,003	7,362
Current	19,269	31,704
Total	25,272	39,066
Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	774
90 or More Days Past Due	0	0
Total Past Due	0	774
Current	6,838	6,966
Total	6,838	7,740
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1,594	2,020
90 or More Days Past Due	130	1,451
Total Past Due	1,724	3,471
Current	17,563	21,650
Total	19,287	25,121
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	4	0
90 or More Days Past Due	0	12
Total Past Due	4	12
Current	80	457
Total	$ 84	$ 469