Portfolio Loans Not Covered by Loss Share ("Non-covered") - Summary of Recorded Investment by Risk Category of Non-covered Loans by Portfolio Class and Category (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Credit Quality, Time Period Expected to Return to Perform	12 months
Total	$ 2,137,313	$ 2,106,039
Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	2,136,292	2,106,028
Total	2,137,313	2,106,039
Non-Covered Loans | Commercial & Industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	1,041,576	962,884
Non-Covered Loans | Real Estate
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	1,054,878	1,126,178
Non-Covered Loans | Commercial - Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	341,631	333,242
Non-Covered Loans | Commercial - Investor Owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	437,688	486,467
Non-Covered Loans | Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	117,032	160,911
Non-Covered Loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	158,527	145,558
Non-Covered Loans | Consumer & Other
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	39,838	16,966
Total	40,859	16,977
Pass [Member] | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Total	1,924,230	1,865,490
Pass [Member] | Non-Covered Loans | Commercial & Industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	977,199	912,766
Pass [Member] | Non-Covered Loans | Commercial - Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	306,321	290,850
Pass [Member] | Non-Covered Loans | Commercial - Investor Owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	368,433	389,886
Pass [Member] | Non-Covered Loans | Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	87,812	124,857
Pass [Member] | Non-Covered Loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	143,613	130,159
Pass [Member] | Non-Covered Loans | Consumer & Other
Financing Receivable, Recorded Investment [Line Items]
Total	40,852	16,972
Special Mention [Member] | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Total	134,410	136,036
Special Mention [Member] | Non-Covered Loans | Commercial & Industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	40,265	29,524
Special Mention [Member] | Non-Covered Loans | Commercial - Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	26,500	26,336
Special Mention [Member] | Non-Covered Loans | Commercial - Investor Owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	42,227	64,707
Special Mention [Member] | Non-Covered Loans | Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	17,175	9,543
Special Mention [Member] | Non-Covered Loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	8,240	5,921
Special Mention [Member] | Non-Covered Loans | Consumer & Other
Financing Receivable, Recorded Investment [Line Items]
Total	3	5
Substandard [Member] | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Total	78,032	101,808
Substandard [Member] | Non-Covered Loans | Commercial & Industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	23,934	18,546
Substandard [Member] | Non-Covered Loans | Commercial - Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	8,810	15,898
Substandard [Member] | Non-Covered Loans | Commercial - Investor Owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	27,028	31,874
Substandard [Member] | Non-Covered Loans | Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	11,582	26,012
Substandard [Member] | Non-Covered Loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	6,674	9,478
Substandard [Member] | Non-Covered Loans | Consumer & Other
Financing Receivable, Recorded Investment [Line Items]
Total	4	0
Doubtful [Member] | Non-Covered Loans
Financing Receivable, Recorded Investment [Line Items]
Total	641	2,705
Doubtful [Member] | Non-Covered Loans | Commercial & Industrial
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	178	2,048
Doubtful [Member] | Non-Covered Loans | Commercial - Owner Occupied
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	0	158
Doubtful [Member] | Non-Covered Loans | Commercial - Investor Owned
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	0	0
Doubtful [Member] | Non-Covered Loans | Construction and Land Development
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	463	499
Doubtful [Member] | Non-Covered Loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Portfolio Loans	0	0
Doubtful [Member] | Non-Covered Loans | Consumer & Other
Financing Receivable, Recorded Investment [Line Items]
Total	$ 0	$ 0