Portfolio Loans - Summary of Aging of Recorded Investment in Past Due Portfolio Loans by Portfolio Class and Category (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Portfolio loans, including unearned loan fees	$ 2,750,737	$ 2,433,916
Non-Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1,537	4,964
Financing Receivable, Recorded Investment, 90 Days Past Due	4,026	7,702
Total Past Due	5,563	12,666
Current	2,745,174	2,421,250
Total	2,750,446	2,433,021
Portfolio loans, including unearned loan fees	2,750,737	2,433,916
Non-Covered Loans | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	505	3,059
Financing Receivable, Recorded Investment, 90 Days Past Due	888	232
Total Past Due	1,393	3,291
Current	1,482,934	1,261,196
Total	1,484,327	1,264,487
Non-Covered Loans | CRE - investor owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	94	0
Financing Receivable, Recorded Investment, 90 Days Past Due	184	496
Total Past Due	278	496
Current	342,681	343,507
Total	342,959	344,003
Non-Covered Loans | CRE - owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	464	261
Financing Receivable, Recorded Investment, 90 Days Past Due	0	4,450
Total Past Due	464	4,711
Current	427,600	392,040
Total	428,064	396,751
Non-Covered Loans | Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	384	702
Financing Receivable, Recorded Investment, 90 Days Past Due	2,273	2,524
Total Past Due	2,657	3,226
Current	158,404	140,652
Total	161,061	143,878
Non-Covered Loans | Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	70	168
Financing Receivable, Recorded Investment, 90 Days Past Due	681	0
Total Past Due	751	168
Current	195,747	185,084
Total	196,498	185,252
Non-Covered Loans | Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	20	774
Financing Receivable, Recorded Investment, 90 Days Past Due	0	0
Total Past Due	20	774
Current	137,808	98,771
Total	137,537	98,650
Portfolio loans, including unearned loan fees	$ 137,828	$ 99,545