Note 3 - Loans (Details) - Average Recorded Investment and Income Recognized on Impaired Loans (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Commercial and Industrial [Member] | Period End Loans No Allocated Allowance For Loan Losses [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	$ 1,485	$ 972	$ 1,287	$ 1,287
Interest income recognized	79	0	133	2
Commercial and Industrial [Member] | Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	711	836	1,231	1,231
Interest income recognized	21	0	37	0
Commercial and Industrial [Member] | Average Recorded Investment and Income Recognized [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	2,196	1,808	2,518	2,518
Interest income recognized	100	0	170	2
Commercial Real Estate Loans [Member] | Period End Loans No Allocated Allowance For Loan Losses [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	8,406	11,716	8,653	8,373
Interest income recognized	267	11	517	208
Commercial Real Estate Loans [Member] | Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	8,462	8,623	8,434	8,343
Interest income recognized	144	0	266	5
Commercial Real Estate Loans [Member] | Average Recorded Investment and Income Recognized [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	16,868	20,339	17,087	17,087
Interest income recognized	411	11	783	213
First Lien Residential Mortgage Loans [Member] | Period End Loans No Allocated Allowance For Loan Losses [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	0	0	0	0
Interest income recognized	0	0	0	0
First Lien Residential Mortgage Loans [Member] | Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	8,776	8,868	9,617	9,617
Interest income recognized	98	15	250	21
First Lien Residential Mortgage Loans [Member] | Average Recorded Investment and Income Recognized [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	8,776	8,868	9,617	9,617
Interest income recognized	98	15	250	21
Junior Lein Residential Mortgage Loans [Member] | Period End Loans No Allocated Allowance For Loan Losses [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	0	0	0	0
Interest income recognized	0	0	0	0
Junior Lein Residential Mortgage Loans [Member] | Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	520	451	534	534
Interest income recognized	7	0	11	130
Junior Lein Residential Mortgage Loans [Member] | Average Recorded Investment and Income Recognized [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	520	451	534	534
Interest income recognized	7	0	11	130
Consumer Loans [Member] | Period End Loans No Allocated Allowance For Loan Losses [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	0	0	0	0
Interest income recognized	0	0	0	0
Consumer Loans [Member] | Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	295	190	318	318
Interest income recognized	5	2	12	2
Consumer Loans [Member] | Average Recorded Investment and Income Recognized [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	295	190	318	318
Interest income recognized	5	2	12	2
Period End Loans No Allocated Allowance For Loan Losses [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	9,891	12,618	9,940	9,940
Interest income recognized	346	11	650	210
Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	18,764	18,968	20,134	20,134
Interest income recognized	275	17	576	158
Average Recorded Investment and Income Recognized [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	28,655	31,656	30,074	30,074
Interest income recognized	$ 621	$ 28	$ 1,226	$ 368