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, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	$ 4,659	$ 9,559
90 or More Days Past Due	39,865	58,665
Total Past Due	44,524	68,224
Current	197,964	232,386
Total	242,488	300,610
Commercial & Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	785	879
90 or More Days Past Due	6,967	9,867
Total Past Due	7,752	10,746
Current	20,882	25,677
Total	28,634	36,423
Real Estate | Commercial - Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	304	1,438
90 or More Days Past Due	7,955	9,684
Total Past Due	8,259	11,122
Current	42,837	51,979
Total	51,096	63,101
Real Estate | Commercial - Investor Owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1,071	2,530
90 or More Days Past Due	2,254	7,021
Total Past Due	3,325	9,551
Current	66,007	65,542
Total	69,332	75,093
Real Estate | Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	727	2,842
90 or More Days Past Due	19,704	28,745
Total Past Due	20,431	31,587
Current	19,592	34,403
Total	40,023	65,990
Real Estate | Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1,771	1,634
90 or More Days Past Due	2,982	3,341
Total Past Due	4,753	4,975
Current	46,873	51,853
Total	51,626	56,828
Consumer & Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1	236
90 or More Days Past Due	3	7
Total Past Due	4	243
Current	1,773	2,932
Total	$ 1,777	$ 3,175