Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI (2) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013 Contract	Sep. 30, 2012 Contract	Sep. 30, 2013 Contract	Sep. 30, 2012 Contract
Troubled Debt Restructurings [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	1	40	10	58
Pre-Modification Outstanding Recorded Investment	$ 32	$ 3,894	$ 4,798	$ 10,549
Post-Modification Outstanding Recorded Investment	32	3,890	4,737	10,556
Troubled Debt Restructurings [Member] | Construction Land Development And Other Financing Receivable [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts			0	11
Pre-Modification Outstanding Recorded Investment			0	4,078
Post-Modification Outstanding Recorded Investment			0	4,078
Troubled Debt Restructurings [Member] | Secured by 1-4 Family Residential Properties [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	1	39	6	44
Pre-Modification Outstanding Recorded Investment	32	3,695	412	5,062
Post-Modification Outstanding Recorded Investment	32	3,691	358	5,069
Troubled Debt Restructurings [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts			1	2
Pre-Modification Outstanding Recorded Investment			952	1,210
Post-Modification Outstanding Recorded Investment			952	1,210
Troubled Debt Restructurings [Member] | Other Loans Secured by Real Estate [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	1	0	1
Pre-Modification Outstanding Recorded Investment	0	199	0	199
Post-Modification Outstanding Recorded Investment	0	199	0	199
Troubled Debt Restructurings [Member] | Commercial and Industrial [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts			2	0
Pre-Modification Outstanding Recorded Investment			944	0
Post-Modification Outstanding Recorded Investment			937	0
Troubled Debt Restructurings [Member] | Other Loans [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts			1	0
Pre-Modification Outstanding Recorded Investment			2,490	0
Post-Modification Outstanding Recorded Investment			2,490	0
Troubled Debt Restructurings that Subsequently Defaulted [Member]
Troubled Debt Restructurings that Subsequently Defaulted [Abstract]
Number of Contracts	5	19	5	19
Recorded Investment	398	6,322	398	6,322
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	10	1	10
Recorded Investment	9	3,671	9	3,671
Troubled Debt Restructurings that Subsequently Defaulted [Member] | Secured by 1-4 Family Residential Properties [Member]
Troubled Debt Restructurings that Subsequently Defaulted [Abstract]
Number of Contracts	4	8	4	8
Recorded Investment	389	1,781	389	1,781
Troubled Debt Restructurings that Subsequently Defaulted [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Troubled Debt Restructurings that Subsequently Defaulted [Abstract]
Number of Contracts	0	1	0	1
Recorded Investment	$ 0	$ 870	$ 0	$ 870