Note 4 - Loans and Allowance for Loan Losses (Details) - Age analysis of past due loans, excluding loans acquired, segregated by class of loans: (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Loans, excluding acquired loans [Member] | Credit Cards [Member]
Consumer:
Gross 30-89 Days Past Due	$ 613	$ 710
90 Days or More Past Due	507	547
Total Past Due	1,120	1,257
Current	172,416	184,279
Total Loans	173,536	185,536
90 Days Past Due & Accruing	172	266
Loans, excluding acquired loans [Member] | Student Loans [Member]
Consumer:
Gross 30-89 Days Past Due	1,031	901
90 Days or More Past Due	2,254	2,234
Total Past Due	3,285	3,135
Current	26,821	31,010
Total Loans	30,106	34,145
90 Days Past Due & Accruing	2,254	2,234
Loans, excluding acquired loans [Member] | Other Consumer [Member]
Consumer:
Gross 30-89 Days Past Due	923	1,149
90 Days or More Past Due	531	529
Total Past Due	1,454	1,678
Current	102,311	103,641
Total Loans	103,765	105,319
90 Days Past Due & Accruing	127	204
Loans, excluding acquired loans [Member] | Consumer Loans [Member]
Consumer:
Gross 30-89 Days Past Due	2,567	2,760
90 Days or More Past Due	3,292	3,310
Total Past Due	5,859	6,070
Current	301,548	318,930
Total Loans	307,407	325,000
90 Days Past Due & Accruing	2,553	2,704
Loans, excluding acquired loans [Member] | Construction Loans [Member]
Consumer:
Gross 30-89 Days Past Due	22	309
90 Days or More Past Due	44	365
Total Past Due	66	674
Current	142,836	137,458
Total Loans	142,902	138,132
90 Days Past Due & Accruing	26
Loans, excluding acquired loans [Member] | Single Family Residential Loans [Member]
Consumer:
Gross 30-89 Days Past Due	2,157	3,069
90 Days or More Past Due	1,412	1,539
Total Past Due	3,569	4,608
Current	360,670	352,299
Total Loans	364,239	356,907
90 Days Past Due & Accruing	439	137
Loans, excluding acquired loans [Member] | Other Commercial Real Estate Loans [Member]
Consumer:
Gross 30-89 Days Past Due	476
90 Days or More Past Due	2,336
Total Past Due	2,812
Current	569,298
Total Loans	572,110
Loans, excluding acquired loans [Member] | Real Estate Loans [Member]
Consumer:
Gross 30-89 Days Past Due	2,655	4,094
90 Days or More Past Due	3,792	5,207
Total Past Due	6,447	9,301
Current	1,072,804	1,053,904
Total Loans	1,079,251	1,063,205
90 Days Past Due & Accruing	465	137
Loans, excluding acquired loans [Member] | Commercial Loans [Member]
Consumer:
Gross 30-89 Days Past Due	478	340
90 Days or More Past Due	346	385
Total Past Due	824	725
Current	151,298	140,611
Total Loans	152,122	141,336
90 Days Past Due & Accruing	115	74
Loans, excluding acquired loans [Member] | Agricultural Loans [Member]
Consumer:
Gross 30-89 Days Past Due	126	81
90 Days or More Past Due	58	113
Total Past Due	184	194
Current	106,929	93,611
Total Loans	107,113	93,805
Loans, excluding acquired loans [Member] | Total Commercial Loans [Member]
Consumer:
Gross 30-89 Days Past Due	604	421
90 Days or More Past Due	404	498
Total Past Due	1,008	919
Current	258,227	234,222
Total Loans	259,235	235,141
90 Days Past Due & Accruing	115	74
Loans, excluding acquired loans [Member] | Other Commercial Loans [Member]
Consumer:
Gross 30-89 Days Past Due		716
90 Days or More Past Due		3,303
Total Past Due		4,019
Current	4,502	564,147
Total Loans	4,502	568,166
Loans, excluding acquired loans [Member] | Total Loans [Member]
Consumer:
Gross 30-89 Days Past Due	5,826	7,275
90 Days or More Past Due	7,488	9,015
Total Past Due	13,314	16,290
Current	1,637,081	1,612,223
Total Loans	1,650,395	1,628,513
90 Days Past Due & Accruing	3,133	2,915
Loans, excluding acquired loans [Member] | Other Loans [Member]
Consumer:
Current		5,167
Total Loans		5,167
Credit Cards [Member]
Consumer:
Total Loans	173,536	185,536
Student Loans [Member]
Consumer:
Total Loans	30,106	34,145
Other Consumer [Member]
Consumer:
Total Loans	103,765	105,319
Consumer Loans [Member]
Consumer:
Total Loans	307,407	325,000
Construction Loans [Member]
Consumer:
Total Loans	142,902	138,132
Single Family Residential Loans [Member]
Consumer:
Total Loans	364,239	356,907
Other Commercial Real Estate Loans [Member]
Consumer:
Total Loans	572,110	568,166
Real Estate Loans [Member]
Consumer:
Total Loans	1,079,251	1,063,205
Commercial Loans [Member]
Consumer:
Total Loans	259,235	235,141
Agricultural Loans [Member]
Consumer:
Total Loans	107,113	93,805
Other Commercial Loans [Member]
Consumer:
Total Loans	152,122	141,336
Other Loans [Member]
Consumer:
Total Loans	$ 4,502	$ 5,167