Portfolio Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Portfolio loans, including unearned loan fees	$ 2,832,616	$ 2,750,737
Non-Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	5,031	1,537
90 or More Days Past Due	3,682	4,026
Total Past Due	8,713	5,563
Current	2,823,903	2,745,174
Total	2,832,452	2,750,446
Portfolio loans, including unearned loan fees	2,832,616	2,750,737
Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	865	505
90 or More Days Past Due	716	888
Total Past Due	1,581	1,393
Current	1,543,399	1,482,934
Total	1,544,980	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	79	184
Total Past Due	79	278
Current	334,101	342,681
Total	334,180	342,959
Non-Covered Loans | Commercial Real Estate Investor Owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	3,990	464
90 or More Days Past Due	0	0
Total Past Due	3,990	464
Current	435,365	427,600
Total	439,355	428,064
Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	384
90 or More Days Past Due	2,273	2,273
Total Past Due	2,273	2,657
Current	173,051	158,404
Total	175,324	161,061
Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	161	70
90 or More Days Past Due	614	681
Total Past Due	775	751
Current	201,480	195,747
Total	202,255	196,498
Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	15	20
90 or More Days Past Due	0	0
Total Past Due	15	20
Current	136,507	137,808
Total	136,358	137,537
Portfolio loans, including unearned loan fees	$ 136,522	$ 137,828