Portfolio Loans Not Covered by Loss Share ("Non-covered") - Summary of Recorded Investment by Category of Non-covered Loans Restructured (Details) (Non-Covered Loans, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 loan
Financing Receivable, Modifications [Line Items]
Number of Loans	1
Pre-Modification Outstanding Recorded Balance	$ 5
Post-Modification Outstanding Recorded Balance	5
Commercial & Industrial
Financing Receivable, Modifications [Line Items]
Number of Loans	1
Pre-Modification Outstanding Recorded Balance	5
Post-Modification Outstanding Recorded Balance	5
Real Estate | Commercial - Owner Occupied
Financing Receivable, Modifications [Line Items]
Number of Loans	0
Pre-Modification Outstanding Recorded Balance	0
Post-Modification Outstanding Recorded Balance	0
Real Estate | Commercial - Investor Owned
Financing Receivable, Modifications [Line Items]
Number of Loans	0
Pre-Modification Outstanding Recorded Balance	0
Post-Modification Outstanding Recorded Balance	0
Real Estate | Construction and Land Development
Financing Receivable, Modifications [Line Items]
Number of Loans	0
Pre-Modification Outstanding Recorded Balance	0
Post-Modification Outstanding Recorded Balance	0
Real Estate | Residential
Financing Receivable, Modifications [Line Items]
Number of Loans	0
Pre-Modification Outstanding Recorded Balance	0
Post-Modification Outstanding Recorded Balance	0
Consumer & Other
Financing Receivable, Modifications [Line Items]
Number of Loans	0
Pre-Modification Outstanding Recorded Balance	0
Post-Modification Outstanding Recorded Balance	$ 0