Portfolio Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Gross	$ 2,883,909	$ 2,750,737
Non-Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	464	1,537
90 or More Days Past Due	5,201	4,026
Total Past Due	5,665	5,563
Current	2,878,244	2,745,174
Loans and Leases Receivable, Gross	2,883,909	2,750,737
Total	2,884,159	2,750,446
Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	83	505
90 or More Days Past Due	2,407	888
Total Past Due	2,490	1,393
Current	1,537,967	1,482,934
Total	1,540,457	1,484,327
Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	94
90 or More Days Past Due	0	184
Total Past Due	0	278
Current	332,639	342,681
Total	332,639	342,959
Non-Covered Loans | Commercial Real Estate Investor Owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	464
90 or More Days Past Due	0	0
Total Past Due	0	464
Current	466,713	427,600
Total	466,713	428,064
Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	367	384
90 or More Days Past Due	2,189	2,273
Total Past Due	2,556	2,657
Current	169,222	158,404
Total	171,778	161,061
Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	10	70
90 or More Days Past Due	605	681
Total Past Due	615	751
Current	210,540	195,747
Total	211,155	196,498
Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	4	20
90 or More Days Past Due	0	0
Total Past Due	4	20
Current	161,163	137,808
Loans and Leases Receivable, Gross	161,167	137,828
Total	$ 161,417	$ 137,537