Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI (2) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013 Contract	Jun. 30, 2012 Contract	Jun. 30, 2013 Contract	Jun. 30, 2012 Contract
Troubled Debt Restructurings [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	3	6	9	18
Pre-Modification Outstanding Recorded Investment	$ 131	$ 825	$ 4,766	$ 6,655
Post-Modification Outstanding Recorded Investment	133	836	4,705	6,666
Troubled Debt Restructurings [Member] | Construction Land Development And Other Financing Receivable [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	0	3	0	11
Pre-Modification Outstanding Recorded Investment	0	467	0	4,078
Post-Modification Outstanding Recorded Investment	0	467	0	4,078
Troubled Debt Restructurings [Member] | Secured by 1-4 Family Residential Properties [Member]
Troubled Debt Restructurings [Abstract]
Number of Contracts	3	3	5	5
Pre-Modification Outstanding Recorded Investment	131	358	380	1,367
Post-Modification Outstanding Recorded Investment	133	369	326	1,378
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] | 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	16	19	16	19
Recorded Investment	1,098	9,129	1,098	9,129
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	10	5,014	10	5,014
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	15	8	15	8
Recorded Investment	1,088	3,234	1,088	3,234
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	$ 881	$ 0	$ 881