Portfolio Loans - Summary of Aging of Recorded Investment in Past Due Non-covered Loans by Portfolio Class and Category (Details) (Non-Covered Loans, USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	$ 1,963	$ 930
90 or More Days Past Due	9,352	14,117
Total Past Due	11,315	15,047
Current	2,283,590	2,122,266
Total	2,294,905	2,137,313
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	785	229
90 or More Days Past Due	706	0
Total Past Due	1,491	229
Current	1,170,524	1,041,347
Total	1,172,015	1,041,576
Commercial real estate - Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	712	0
90 or More Days Past Due	1,156	428
Total Past Due	1,868	428
Current	364,856	341,203
Total	366,724	341,631
Commercial real estate - Investor owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	451	0
90 or More Days Past Due	4,577	6,132
Total Past Due	5,028	6,132
Current	386,763	431,556
Total	391,791	437,688
Construction and land development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	464
90 or More Days Past Due	2,528	7,344
Total Past Due	2,528	7,808
Current	121,360	109,224
Total	123,888	117,032
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	237
90 or More Days Past Due	385	213
Total Past Due	385	450
Current	187,209	158,077
Total	187,594	158,527
Consumer and other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	15	0
90 or More Days Past Due	0	0
Total Past Due	15	0
Current	52,878	40,859
Total	$ 52,893	$ 40,859