Portfolio Loans Not Covered by Loss Share ("Non-covered") - Summary of Recorded Investment by Category of Non-covered Loans Restructured (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 loan	Dec. 31, 2011 loan
Financing Receivable, Modifications [Line Items]
Financing Receivable Modifications Reserve	$ 159
Non-Covered Loans
Financing Receivable, Modifications [Line Items]
Number of Loans	2	10
Pre-Modification Outstanding Recorded Balance	1,805	11,474
Post-Modification Outstanding Recorded Balance	1,440	9,982
Non-Covered Loans | Commercial & Industrial
Financing Receivable, Modifications [Line Items]
Number of Loans	1	5
Pre-Modification Outstanding Recorded Balance	5	2,102
Post-Modification Outstanding Recorded Balance	5	1,159
Non-Covered Loans | Real Estate | Commercial - Owner Occupied
Financing Receivable, Modifications [Line Items]
Number of Loans	0	1
Pre-Modification Outstanding Recorded Balance	0	443
Post-Modification Outstanding Recorded Balance	0	443
Non-Covered Loans | Real Estate | Commercial - Investor Owned
Financing Receivable, Modifications [Line Items]
Number of Loans	0	1
Pre-Modification Outstanding Recorded Balance	0	4,365
Post-Modification Outstanding Recorded Balance	0	4,480
Non-Covered Loans | Real Estate | Construction and Land Development
Financing Receivable, Modifications [Line Items]
Number of Loans	1	2
Pre-Modification Outstanding Recorded Balance	1,800	4,341
Post-Modification Outstanding Recorded Balance	1,435	3,677
Non-Covered Loans | Real Estate | Residential
Financing Receivable, Modifications [Line Items]
Number of Loans	0	1
Pre-Modification Outstanding Recorded Balance	0	223
Post-Modification Outstanding Recorded Balance	0	223
Non-Covered Loans | Consumer & Other
Financing Receivable, Modifications [Line Items]
Number of Loans	0	0
Pre-Modification Outstanding Recorded Balance	0	0
Post-Modification Outstanding Recorded Balance	$ 0	$ 0