Loans (Details 7) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Summary of delinquencies, by class
30-89 days past due	$ 4,198	$ 4,901
Greater than 90 days past due on nonaccrual	24,176	53,028
Recorded investment greater than 90 days and accruing
Total past due	28,374	57,929
Current	710,058	729,807
Total loans	738,432	787,736
Total gross loans, 30-89 days past due	4,158	4,901
Total gross loans, Greater than 90 days past due on nonaccrual	22,063	47,216
Total gross loans, Recorded investment greater than 90 days and accruing
Total gross loans, past due	26,221	52,117
Total gross loans, Current	697,765	721,441
Other loans held for sale	723,986	773,558
Total Consumer [Member]
Summary of delinquencies, by class
30-89 days past due	560	760
Greater than 90 days past due on nonaccrual	372	489
Recorded investment greater than 90 days and accruing
Total past due	932	1,249
Current	5,112	51,522
Total loans	52,044	52,771
Total Commercial real estate [Member]
Summary of delinquencies, by class
30-89 days past due	1,506	668
Greater than 90 days past due on nonaccrual	16,715	41,955
Recorded investment greater than 90 days and accruing
Total past due	18,221	42,623
Current	433,543	450,131
Total loans	451,764	492,754
Total Single Family Residential Loans [Member]
Summary of delinquencies, by class
30-89 days past due	1,844	3,157
Greater than 90 days past due on nonaccrual	5,994	9,271
Recorded investment greater than 90 days and accruing
Total past due	7,838	12,428
Current	167,497	173,076
Total loans	175,335	185,504
Other loans held for sale [Member]
Summary of delinquencies, by class
30-89 days past due	(40)
Greater than 90 days past due on nonaccrual	(2,113)	(5,812)
Recorded investment greater than 90 days and accruing
Total past due	(2,153)	(5,812)
Current	(12,293)	(8,366)
Other loans held for sale	14,446	(14,178)
Construction, land development, and other land loans [Member] | Total Commercial real estate [Member]
Summary of delinquencies, by class
30-89 days past due	424	94
Greater than 90 days past due on nonaccrual	12,645	27,085
Recorded investment greater than 90 days and accruing
Total past due	13,069	27,179
Current	56,621	64,975
Total loans	69,690	92,154
Multifamily residential [Member]
Summary of delinquencies, by class
Other loans held for sale	12,694	17,945
Multifamily residential [Member] | Total Commercial real estate [Member]
Summary of delinquencies, by class
30-89 days past due
Greater than 90 days past due on nonaccrual
Recorded investment greater than 90 days and accruing
Total past due
Current	12,694	17,945
Total loans	12,694	17,945
Nonfarm nonresidential [Member]
Summary of delinquencies, by class
Other loans held for sale	361,896	373,018
Nonfarm nonresidential [Member] | Total Commercial real estate [Member]
Summary of delinquencies, by class
30-89 days past due	1,082	574
Greater than 90 days past due on nonaccrual	4,070	14,870
Recorded investment greater than 90 days and accruing
Total past due	5,152	15,444
Current	364,228	367,211
Total loans	369,380	382,655
Single Family Residential Revolving Open End Loans [Member]
Summary of delinquencies, by class
Other loans held for sale	58,974	58,971
Single Family Residential Revolving Open End Loans [Member] | Total Single Family Residential Loans [Member]
Summary of delinquencies, by class
30-89 days past due	734	379
Greater than 90 days past due on nonaccrual	891	843
Recorded investment greater than 90 days and accruing
Total past due	1,625	1,222
Current	58,352	57,749
Total loans	59,977	58,971
Single Family Residential Closed End First Lien [Member]
Summary of delinquencies, by class
Other loans held for sale	108,187	119,580
Single Family Residential Closed End First Lien [Member] | Total Single Family Residential Loans [Member]
Summary of delinquencies, by class
30-89 days past due	1,048	2,633
Greater than 90 days past due on nonaccrual	4,786	7,957
Recorded investment greater than 90 days and accruing
Total past due	5,834	10,590
Current	103,637	108,990
Total loans	109,471	119,580
Single Family Residential Closed End Junior Lien [Member]
Summary of delinquencies, by class
Other loans held for sale	5,876	6,953
Single Family Residential Closed End Junior Lien [Member] | Total Single Family Residential Loans [Member]
Summary of delinquencies, by class
30-89 days past due	62	145
Greater than 90 days past due on nonaccrual	317	471
Recorded investment greater than 90 days and accruing
Total past due	379	616
Current	5,508	6,337
Total loans	5,887	6,953
Commercial and Industrial [Member]
Summary of delinquencies, by class
Other loans held for sale	48,853
Commercial and Industrial [Member] | Total Consumer [Member]
Summary of delinquencies, by class
30-89 days past due	288	314
Greater than 90 days past due on nonaccrual	1,085	1,313
Recorded investment greater than 90 days and accruing
Total past due	1,373	1,627
Current	48,390	47,754
Total loans	49,763	49,381
Credit cards [Member]
Summary of delinquencies, by class
Other loans held for sale	52	195
Credit cards [Member] | Total Consumer [Member]
Summary of delinquencies, by class
30-89 days past due
Greater than 90 days past due on nonaccrual	32	16
Recorded investment greater than 90 days and accruing
Total past due	32	16
Current	20	179
Total loans	52	195
Consumer-other [Member]
Summary of delinquencies, by class
30-89 days past due	560	760
Greater than 90 days past due on nonaccrual	340	473
Recorded investment greater than 90 days and accruing
Total past due	900	1,233
Current	51,092	51,343
Total loans	51,992	52,576
Other loans held for sale	51,764	52,576
Farmland [Member]
Summary of delinquencies, by class
30-89 days past due
Greater than 90 days past due on nonaccrual	10
Recorded investment greater than 90 days and accruing
Total past due	10
Current	4,019	3,513
Total loans	4,229	3,513
Obligations of states and political subdivisions of U.S [Member]
Summary of delinquencies, by class
30-89 days past due
Greater than 90 days past due on nonaccrual
Recorded investment greater than 90 days and accruing
Total past due
Current	861	903
Total loans	861	903
Other [Member]
Summary of delinquencies, by class
30-89 days past due		2
Greater than 90 days past due on nonaccrual
Recorded investment greater than 90 days and accruing
Total past due		2
Current	4,636	2,908
Total loans	4,636	2,910
Other loans held for sale	$ 8,692