Loans Held for Investment (LHFI) and Allowance for Loan Losses, excluding Covered Loans, Part 6 (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Troubled Debt Restructurings [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	12
Pre-Modification Outstanding Recorded Investment	$ 5,830
Post-Modification Outstanding Recorded Investment	5,830
Troubled Debt Restructurings [Member] | Construction Land Development And Other Financing Receivable [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	8
Pre-Modification Outstanding Recorded Investment	3,611
Post-Modification Outstanding Recorded Investment	3,611
Troubled Debt Restructurings [Member] | Residential Financing Receivable [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	2
Pre-Modification Outstanding Recorded Investment	1,009
Post-Modification Outstanding Recorded Investment	1,009
Troubled Debt Restructurings [Member] | Commercial And Industrial Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	2
Pre-Modification Outstanding Recorded Investment	1,210
Post-Modification Outstanding Recorded Investment	1,210
Troubled Debt Restructurings that Subsequently Defaulted [Member]
Troubled Debt Restructurings that Subsequently Defaulted [Abstract]
Number of Contracts	4
Recorded Investment	1,681
Troubled Debt Restructurings that Subsequently Defaulted [Member] | Construction Land Development And Other Financing Receivable [Member]
Troubled Debt Restructurings that Subsequently Defaulted [Abstract]
Number of Contracts	1
Recorded Investment	299
Troubled Debt Restructurings that Subsequently Defaulted [Member] | Residential Financing Receivable [Member]
Troubled Debt Restructurings that Subsequently Defaulted [Abstract]
Number of Contracts	3
Recorded Investment	$ 1,382