Portfolio Loans Covered by Loss Share (Covered loans) - Summary of Aging of the Recorded Investment in Past Due Covered Loans by Portfolio Class and Category (Details) (Covered Loans, USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	$ 10,286	$ 2,783
90 or More Days Past Due	19,067	26,175
Total Past Due	29,353	28,958
Current	140,510	172,160
Total	169,863	201,118
Commercial & Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	3,655	319
90 or More Days Past Due	549	3,925
Total Past Due	4,204	4,244
Current	7,280	17,790
Total	11,484	22,034
Real Estate | Commercial - Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	4,053	887
90 or More Days Past Due	4,521	5,144
Total Past Due	8,574	6,031
Current	35,112	41,109
Total	43,686	47,140
Real Estate | Commercial - Investor Owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	189	308
90 or More Days Past Due	3,386	665
Total Past Due	3,575	973
Current	50,512	56,629
Total	54,087	57,602
Real Estate | Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	22	36
90 or More Days Past Due	8,470	13,532
Total Past Due	8,492	13,568
Current	12,630	16,969
Total	21,122	30,537
Real Estate | Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	2,363	1,232
90 or More Days Past Due	2,141	2,907
Total Past Due	4,504	4,139
Current	33,894	38,392
Total	38,398	42,531
Consumer & Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	4	1
90 or More Days Past Due	0	2
Total Past Due	4	3
Current	1,082	1,271
Total	$ 1,086	$ 1,274