Loans and Allowance for Credit Losses (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Recorded investment in loans:
Total loans	$ 1,266,361	$ 1,155,421	$ 1,168,747
Current [Member]
Recorded investment in loans:
Total commercial	611,361	535,414
Total Real estate - construction	92,688	72,612
Total Real estate - mortgage	516,145	485,654
Total Consumer	21,588	25,978
Total Other	6,344	6,121
Total loans	1,248,126	1,125,779
30 - 89 days past due [Member]
Recorded investment in loans:
Total commercial	4,833	3,730
Total Real estate - construction	71	525
Total Real estate - mortgage	3,722	7,222
Total Consumer	303	609
Total Other	0	0
Total loans	8,929	12,086
90+ days past due [Member]
Recorded investment in loans:
Total commercial	0	0
Total Real estate - construction	0	0
Total Real estate - mortgage	0	0
Total Consumer	34	44
Total Other	0	0
Total loans	34	44
Nonaccrual Loans [Member]
Recorded investment in loans:
Total commercial	4,251	6,198
Total Real estate - construction	497	2,529
Total Real estate - mortgage	4,391	8,525
Total Consumer	132	260
Total Other	1	0
Total loans	9,272	17,512
Total Loans Receivable [Member]
Recorded investment in loans:
Total commercial	620,445	545,342
Total Real estate - construction	93,256	75,666
Total Real estate - mortgage	524,258	501,401
Total Consumer	22,057	26,891
Total Other	6,345	6,121
Total loans	1,266,361	1,155,421
Secured by owner-occupied nonfarm nonresidential properties [Member]
Recorded investment in loans:
Total commercial	275,880	247,628
Secured by owner-occupied nonfarm nonresidential properties [Member] | Current [Member]
Recorded investment in loans:
Total commercial	270,028	241,099
Secured by owner-occupied nonfarm nonresidential properties [Member] | 30 - 89 days past due [Member]
Recorded investment in loans:
Total commercial	3,149	1,985
Secured by owner-occupied nonfarm nonresidential properties [Member] | 90+ days past due [Member]
Recorded investment in loans:
Total commercial	0	0
Secured by owner-occupied nonfarm nonresidential properties [Member] | Nonaccrual Loans [Member]
Recorded investment in loans:
Total commercial	2,703	4,544
Secured by owner-occupied nonfarm nonresidential properties [Member] | Total Loans Receivable [Member]
Recorded investment in loans:
Total commercial	275,880	247,628
Secured by other nonfarm nonresidential properties [Member]
Recorded investment in loans:
Total commercial	231,518	186,864
Secured by other nonfarm nonresidential properties [Member] | Current [Member]
Recorded investment in loans:
Total commercial	228,948	184,270
Secured by other nonfarm nonresidential properties [Member] | 30 - 89 days past due [Member]
Recorded investment in loans:
Total commercial	1,376	1,034
Secured by other nonfarm nonresidential properties [Member] | 90+ days past due [Member]
Recorded investment in loans:
Total commercial	0	0
Secured by other nonfarm nonresidential properties [Member] | Nonaccrual Loans [Member]
Recorded investment in loans:
Total commercial	1,194	1,560
Secured by other nonfarm nonresidential properties [Member] | Total Loans Receivable [Member]
Recorded investment in loans:
Total commercial	231,518	186,864
Other commercial and industrial [Member]
Recorded investment in loans:
Total commercial	113,047	110,850
Other commercial and industrial [Member] | Current [Member]
Recorded investment in loans:
Total commercial	112,385	110,045
Other commercial and industrial [Member] | 30 - 89 days past due [Member]
Recorded investment in loans:
Total commercial	308	711
Other commercial and industrial [Member] | 90+ days past due [Member]
Recorded investment in loans:
Total commercial	0	0
Other commercial and industrial [Member] | Nonaccrual Loans [Member]
Recorded investment in loans:
Total commercial	354	94
Other commercial and industrial [Member] | Total Loans Receivable [Member]
Recorded investment in loans:
Total commercial	113,047	110,850
Construction loans - 1 to 4 family residential [Member]
Recorded investment in loans:
Total Real estate - construction	14,175	13,206
Construction loans - 1 to 4 family residential [Member] | Current [Member]
Recorded investment in loans:
Total Real estate - construction	14,175	12,936
Construction loans - 1 to 4 family residential [Member] | 30 - 89 days past due [Member]
Recorded investment in loans:
Total Real estate - construction	0	0
Construction loans - 1 to 4 family residential [Member] | 90+ days past due [Member]
Recorded investment in loans:
Total Real estate - construction	0	0
Construction loans - 1 to 4 family residential [Member] | Nonaccrual Loans [Member]
Recorded investment in loans:
Total Real estate - construction	0	270
Construction loans - 1 to 4 family residential [Member] | Total Loans Receivable [Member]
Recorded investment in loans:
Total Real estate - construction	14,175	13,206
Other construction and land development [Member]
Recorded investment in loans:
Total Real estate - construction	79,081	62,460
Other construction and land development [Member] | Current [Member]
Recorded investment in loans:
Total Real estate - construction	78,513	59,676
Other construction and land development [Member] | 30 - 89 days past due [Member]
Recorded investment in loans:
Total Real estate - construction	71	525
Other construction and land development [Member] | 90+ days past due [Member]
Recorded investment in loans:
Total Real estate - construction	0	0
Other construction and land development [Member] | Nonaccrual Loans [Member]
Recorded investment in loans:
Total Real estate - construction	497	2,259
Other construction and land development [Member] | Total Loans Receivable [Member]
Recorded investment in loans:
Total Real estate - construction	79,081	62,460
Closed-end loans secured by 1 to 4 family residential properties [Member]
Recorded investment in loans:
Total Real estate - mortgage	293,200	277,820
Closed-end loans secured by 1 to 4 family residential properties [Member] | Current [Member]
Recorded investment in loans:
Total Real estate - mortgage	288,115	268,141
Closed-end loans secured by 1 to 4 family residential properties [Member] | 30 - 89 days past due [Member]
Recorded investment in loans:
Total Real estate - mortgage	1,950	4,436
Closed-end loans secured by 1 to 4 family residential properties [Member] | 90+ days past due [Member]
Recorded investment in loans:
Total Real estate - mortgage	0	0
Closed-end loans secured by 1 to 4 family residential properties [Member] | Nonaccrual Loans [Member]
Recorded investment in loans:
Total Real estate - mortgage	3,135	5,243
Closed-end loans secured by 1 to 4 family residential properties [Member] | Total Loans Receivable [Member]
Recorded investment in loans:
Total Real estate - mortgage	293,200	277,820
Lines of credit secured by 1 to 4 family residential properties [Member]
Recorded investment in loans:
Total Real estate - mortgage	194,210	200,465
Lines of credit secured by 1 to 4 family residential properties [Member] | Current [Member]
Recorded investment in loans:
Total Real estate - mortgage	191,182	196,663
Lines of credit secured by 1 to 4 family residential properties [Member] | 30 - 89 days past due [Member]
Recorded investment in loans:
Total Real estate - mortgage	1,772	2,666
Lines of credit secured by 1 to 4 family residential properties [Member] | 90+ days past due [Member]
Recorded investment in loans:
Total Real estate - mortgage	0	0
Lines of credit secured by 1 to 4 family residential properties [Member] | Nonaccrual Loans [Member]
Recorded investment in loans:
Total Real estate - mortgage	1,256	1,136
Lines of credit secured by 1 to 4 family residential properties [Member] | Total Loans Receivable [Member]
Recorded investment in loans:
Total Real estate - mortgage	194,210	200,465
Loans secured by 5 or more family residential property [Member] | Current [Member]
Recorded investment in loans:
Total Real estate - mortgage	36,848	20,850
Loans secured by 5 or more family residential property [Member] | 30 - 89 days past due [Member]
Recorded investment in loans:
Total Real estate - mortgage	0	120
Loans secured by 5 or more family residential property [Member] | 90+ days past due [Member]
Recorded investment in loans:
Total Real estate - mortgage	0	0
Loans secured by 5 or more family residential property [Member] | Nonaccrual Loans [Member]
Recorded investment in loans:
Total Real estate - mortgage	0	2,146
Loans secured by 5 or more family residential property [Member] | Total Loans Receivable [Member]
Recorded investment in loans:
Total Real estate - mortgage	36,848	23,116
Credit Cards [Member]
Recorded investment in loans:
Total Consumer	7,613	7,610
Credit Cards [Member] | Current [Member]
Recorded investment in loans:
Total Consumer	7,499	7,488
Credit Cards [Member] | 30 - 89 days past due [Member]
Recorded investment in loans:
Total Consumer	80	78
Credit Cards [Member] | 90+ days past due [Member]
Recorded investment in loans:
Total Consumer	34	44
Credit Cards [Member] | Nonaccrual Loans [Member]
Recorded investment in loans:
Total Consumer	0	0
Credit Cards [Member] | Total Loans Receivable [Member]
Recorded investment in loans:
Total Consumer	7,613	7,610
Other Revolving Credit Plans [Member]
Recorded investment in loans:
Total Consumer	8,470	9,018
Other Revolving Credit Plans [Member] | Current [Member]
Recorded investment in loans:
Total Consumer	8,243	8,821
Other Revolving Credit Plans [Member] | 30 - 89 days past due [Member]
Recorded investment in loans:
Total Consumer	114	85
Other Revolving Credit Plans [Member] | 90+ days past due [Member]
Recorded investment in loans:
Total Consumer	0	0
Other Revolving Credit Plans [Member] | Nonaccrual Loans [Member]
Recorded investment in loans:
Total Consumer	113	112
Other Revolving Credit Plans [Member] | Total Loans Receivable [Member]
Recorded investment in loans:
Total Consumer	8,470	9,018
Other Consumer Loans [Member]
Recorded investment in loans:
Total Consumer	5,974	10,263
Other Consumer Loans [Member] | Current [Member]
Recorded investment in loans:
Total Consumer	5,846	9,669
Other Consumer Loans [Member] | 30 - 89 days past due [Member]
Recorded investment in loans:
Total Consumer	109	446
Other Consumer Loans [Member] | 90+ days past due [Member]
Recorded investment in loans:
Total Consumer	0	0
Other Consumer Loans [Member] | Nonaccrual Loans [Member]
Recorded investment in loans:
Total Consumer	19	148
Other Consumer Loans [Member] | Total Loans Receivable [Member]
Recorded investment in loans:
Total Consumer	5,974	10,263
All other loans [Member]
Recorded investment in loans:
Total Other	6,345	6,121
All other loans [Member] | Current [Member]
Recorded investment in loans:
Total Other	6,344	6,121
All other loans [Member] | 30 - 89 days past due [Member]
Recorded investment in loans:
Total Other	0	0
All other loans [Member] | 90+ days past due [Member]
Recorded investment in loans:
Total Other	0	0
All other loans [Member] | Nonaccrual Loans [Member]
Recorded investment in loans:
Total Other	1	0
All other loans [Member] | Total Loans Receivable [Member]
Recorded investment in loans:
Total Other	$ 6,345	$ 6,121