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, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	$ 3,465	$ 3,672
90 or More Days Past Due	4,931	10,722
Total Past Due	8,396	14,394
Current	79,248	84,709
Total	87,644	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	36	16
Total Past Due	36	16
Current	4,289	3,996
Total	4,325	4,012
CRE - owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	647	0
90 or More Days Past Due	551	2,759
Total Past Due	1,198	2,759
Current	20,183	19,936
Total	21,381	22,695
Commercial Real Estate Investor Owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	2,184	878
90 or More Days Past Due	3,356	6,484
Total Past Due	5,540	7,362
Current	27,075	31,704
Total	32,615	39,066
Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	455	774
90 or More Days Past Due	0	0
Total Past Due	455	774
Current	6,957	6,966
Total	7,412	7,740
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	170	2,020
90 or More Days Past Due	988	1,451
Total Past Due	1,158	3,471
Current	20,471	21,650
Total	21,629	25,121
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	9	0
90 or More Days Past Due	0	12
Total Past Due	9	12
Current	273	457
Total	$ 282	$ 469