Portfolio Loans Not Covered by Loss Share ("Non-covered") - Summary of Recorded Investment in Impaired Non-covered Loans by Category (Details) (Non-Covered Loans, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	$ 37,287	$ 30,885
Restructured	1,440	9,982
Loans over 90 days past due and still accruing interest	0	755
Total Recorded Investment	38,727	41,622
Commercial & Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	8,929	4,475
Restructured	5	1,159
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	8,934	5,634
Real Estate | Commercial - Investor Owned
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	16,762	6,647
Restructured	0	4,480
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	16,762	11,127
Real Estate | Commercial - Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	5,772	4,129
Restructured	0	443
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	5,772	4,572
Real Estate | Construction and Land Development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	3,260	10,335
Restructured	1,435	3,677
Loans over 90 days past due and still accruing interest	0	755
Total Recorded Investment	4,695	14,767
Real Estate | Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	2,564	5,299
Restructured	0	223
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	2,564	5,522
Consumer & Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual	0	0
Restructured	0	0
Loans over 90 days past due and still accruing interest	0	0
Total Recorded Investment	$ 0	$ 0