Portfolio Loans Not Covered by Loss Share ("Non-covered") - Summary of Aging of Recorded Investment in Past Due Non-covered Loans by Portfolio Class and Category (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	$ 2,137,313	$ 2,106,039
Non-Covered Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	930	3,217
90 or More Days Past Due	14,117	8,278
Total Past Due	15,047	11,495
Current	2,122,266	2,094,544
Total	2,136,292	2,106,028
Total	2,137,313	2,106,039
Non-Covered Loans | Commercial & Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	229	14
90 or More Days Past Due	0	0
Total Past Due	229	14
Current	1,041,347	962,870
Total	1,041,576	962,884
Non-Covered Loans | Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total	1,054,878	1,126,178
Non-Covered Loans | Consumer & Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	34
90 or More Days Past Due	0	0
Total Past Due	0	34
Current	40,859	16,943
Total	39,838	16,966
Total	40,859	16,977
Non-Covered Loans | Commercial - Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	1,352
90 or More Days Past Due	428	2,081
Total Past Due	428	3,433
Current	341,203	329,809
Total	341,631	333,242
Non-Covered Loans | Commercial - Investor Owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	0	0
90 or More Days Past Due	6,132	4,045
Total Past Due	6,132	4,045
Current	431,556	482,422
Total	437,688	486,467
Non-Covered Loans | Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	464	1,201
90 or More Days Past Due	7,344	1,559
Total Past Due	7,808	2,760
Current	109,224	158,151
Total	117,032	160,911
Non-Covered Loans | Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	237	616
90 or More Days Past Due	213	593
Total Past Due	450	1,209
Current	158,077	144,349
Total	$ 158,527	$ 145,558