Note 8 - Loans and Allowance for Loan Losses (Details) - Impaired Loans (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
With No Allowance - Recorded Investment	$ 21,979	$ 22,515
With No Allowance - Unpaid Principal Balance	22,907	23,404
With an Allowance - Recorded Investment	4,527	5,102
With an Allowance - Unpaid Principal Balance	5,093	5,609
With an Allowance - Related Allowance	1,999	2,022
Total - Recorded Investment	26,506	27,617
Total - Unpaid Principal Balance	28,000	29,013
Total - Related Allowance	1,999	2,022
Total - Average Recorded Investment	27,549	29,254
Total - Interest Income Recognized	197	560
Commercial:Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
With No Allowance - Recorded Investment	7,583	8,222
With No Allowance - Unpaid Principal Balance	7,798	8,417
With an Allowance - Recorded Investment	1,635	2,082
With an Allowance - Unpaid Principal Balance	1,934	2,350
With an Allowance - Related Allowance	1,153	1,106
Total - Recorded Investment	9,218	10,304
Total - Unpaid Principal Balance	9,732	10,767
Total - Related Allowance	1,153	1,106
Total - Average Recorded Investment	10,343	6,732
Total - Interest Income Recognized	90	34
Commercial:Construction [Member]
Financing Receivable, Impaired [Line Items]
With No Allowance - Recorded Investment	706	916
With No Allowance - Unpaid Principal Balance	942	1,140
With an Allowance - Recorded Investment	421	435
With an Allowance - Unpaid Principal Balance	485	493
With an Allowance - Related Allowance	76	121
Total - Recorded Investment	1,127	1,351
Total - Unpaid Principal Balance	1,427	1,633
Total - Related Allowance	76	121
Total - Average Recorded Investment	1,297	3,179
Total - Interest Income Recognized		46
Commercial:Secured by Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
With No Allowance - Recorded Investment	12,700	12,251
With No Allowance - Unpaid Principal Balance	13,082	12,568
With an Allowance - Recorded Investment		37
With an Allowance - Unpaid Principal Balance		37
With an Allowance - Related Allowance		9
Total - Recorded Investment	12,700	12,288
Total - Unpaid Principal Balance	13,082	12,605
Total - Related Allowance		9
Total - Average Recorded Investment	12,346	13,765
Total - Interest Income Recognized	105	399
Commercial Secured By Residential Real Estate [Member]
Financing Receivable, Impaired [Line Items]
With No Allowance - Recorded Investment	674	728
With No Allowance - Unpaid Principal Balance	719	839
With an Allowance - Recorded Investment	2,065	2,105
With an Allowance - Unpaid Principal Balance	2,228	2,248
With an Allowance - Related Allowance	636	639
Total - Recorded Investment	2,739	2,833
Total - Unpaid Principal Balance	2,947	3,087
Total - Related Allowance	636	639
Total - Average Recorded Investment	2,787	3,090
Total - Interest Income Recognized		23
State And Political Subdivisions [Member]
Financing Receivable, Impaired [Line Items]
Total - Average Recorded Investment		1,636
Total - Interest Income Recognized		53
Indirect Lease Financing [Member]
Financing Receivable, Impaired [Line Items]
With No Allowance - Recorded Investment	17	13
With No Allowance - Unpaid Principal Balance	21	16
With an Allowance - Recorded Investment	10	24
With an Allowance - Unpaid Principal Balance	13	27
With an Allowance - Related Allowance	1	3
Total - Recorded Investment	27	37
Total - Unpaid Principal Balance	34	43
Total - Related Allowance	1	3
Total - Average Recorded Investment	31	63
Total - Interest Income Recognized	1
Retail:1-4 Family Residential Mortgages [Member]
Financing Receivable, Impaired [Line Items]
With No Allowance - Recorded Investment	244	250
With No Allowance - Unpaid Principal Balance	271	274
With an Allowance - Recorded Investment	271	272
With an Allowance - Unpaid Principal Balance	283	284
With an Allowance - Related Allowance	63	63
Total - Recorded Investment	515	522
Total - Unpaid Principal Balance	554	558
Total - Related Allowance	63	63
Total - Average Recorded Investment	518	495
Total - Interest Income Recognized	1	5
Retail Home Equity Loans And Lines [Member]
Financing Receivable, Impaired [Line Items]
With No Allowance - Recorded Investment	55	135
With No Allowance - Unpaid Principal Balance	74	150
With an Allowance - Recorded Investment	125	131
With an Allowance - Unpaid Principal Balance	150	154
With an Allowance - Related Allowance	70	70
Total - Recorded Investment	180	266
Total - Unpaid Principal Balance	224	304
Total - Related Allowance	70	70
Total - Average Recorded Investment	223	293
Retail:Consumer [Member]
Financing Receivable, Impaired [Line Items]
With an Allowance - Recorded Investment		16
With an Allowance - Unpaid Principal Balance		16
With an Allowance - Related Allowance		11
Total - Recorded Investment		16
Total - Unpaid Principal Balance		16
Total - Related Allowance		11
Total - Average Recorded Investment	$ 4	$ 1