Loans and Allowance for Credit Losses (Details 10) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Allowance for credit losses
Balance, beginning of period	$ 26,395	$ 25,231	$ 26,630	$ 28,844
Total chargeoffs	2,346	19,663	5,905	29,974
Total recoveries	1,303	567	2,611	1,462
Net loans charged off	1,043	19,096	3,294	28,512
Provision for credit losses	33	28,881	2,049	34,684
Balance, ending of period	25,385	35,016	25,385	35,016
Total Commercial [Member]
Allowance for credit losses
Total chargeoffs	324	9,357	859	11,698
Total recoveries	796	118	1,020	294
Total Real estate - construction [Member]
Allowance for credit losses
Total chargeoffs	372	4,272	1,125	7,014
Total recoveries	59	107	392	292
Total Real estate - mortgage [Member]
Allowance for credit losses
Total chargeoffs	1,136	5,716	2,777	10,411
Total recoveries	366	176	922	576
Total Consumer [Member]
Allowance for credit losses
Total chargeoffs	176	317	806	848
Total recoveries	69	157	214	278
Total Other [Member]
Allowance for credit losses
Total chargeoffs	338	1	338	3
Total recoveries	13	9	63	22
Secured by owner-occupied nonfarm nonresidential properties [Member]
Allowance for credit losses
Total chargeoffs	0	4,609	175	5,755
Secured by other nonfarm nonresidential properties [Member]
Allowance for credit losses
Total chargeoffs	0	1,491	125	2,101
Other commercial and industrial [Member]
Allowance for credit losses
Total chargeoffs	324	3,257	559	3,842
Construction Loans - 1 to 4 Family Residential [Member]
Allowance for credit losses
Total chargeoffs	0	193	182	403
Other construction and land development [Member]
Allowance for credit losses
Total chargeoffs	372	4,079	943	6,611
Closed-end loans secured by 1 to 4 family residential properties [Member]
Allowance for credit losses
Total chargeoffs	674	4,034	1,964	6,560
Lines of credit secured by 1 to 4 family residential properties [Member]
Allowance for credit losses
Total chargeoffs	462	1,409	813	3,578
Loans secured by 5 or more family residential properties [Member]
Allowance for credit losses
Total chargeoffs	0	273	0	273
Credit cards [member]
Allowance for credit losses
Total chargeoffs	49	54	162	265
Other consumer loans [member]
Allowance for credit losses
Total chargeoffs	$ 127	$ 263	$ 644	$ 583