Note 3 - Loans (Details) - Average Recorded Investment and Income Recognized on Impaired Loans (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Commercial and Industrial [Member] | Period End Loans No Allocated Allowance For Loan Losses [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	$ 984	$ 2,779	$ 1,050	$ 3,355
Interest income recognized	1	18	134	164
Commercial and Industrial [Member] | Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	730	449	1,125	532
Interest income recognized	22	1	59	2
Commercial and Industrial [Member] | Average Recorded Investment and Income Recognized [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	1,714	3,228	2,175	3,887
Interest income recognized	23	19	193	166
Commercial Real Estate Loans [Member] | Period End Loans No Allocated Allowance For Loan Losses [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	7,387	9,260	8,163	10,463
Interest income recognized	40	113	557	648
Commercial Real Estate Loans [Member] | Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	8,694	10,097	8,517	11,107
Interest income recognized	163	9	429	100
Commercial Real Estate Loans [Member] | Average Recorded Investment and Income Recognized [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	16,081	19,357	16,680	21,570
Interest income recognized	203	122	986	748
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	9,451	0	9,749
Interest income recognized	0	56	0	295
First Lien Residential Mortgage Loans [Member] | Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	7,420	0	8,977	0
Interest income recognized	68	0	318	0
First Lien Residential Mortgage Loans [Member] | Average Recorded Investment and Income Recognized [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	7,420	9,451	8,977	9,749
Interest income recognized	68	56	318	295
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	530	0	487
Interest income recognized	0	2	0	9
Junior Lein Residential Mortgage Loans [Member] | Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	388	0	497	0
Interest income recognized	3	0	14	0
Junior Lein Residential Mortgage Loans [Member] | Average Recorded Investment and Income Recognized [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	388	530	497	487
Interest income recognized	3	2	14	9
Consumer Loans [Member] | Period End Loans No Allocated Allowance For Loan Losses [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	0	481	0	414
Interest income recognized	0	2	0	15
Consumer Loans [Member] | Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	117	0	268	0
Interest income recognized	1	0	13	0
Consumer Loans [Member] | Average Recorded Investment and Income Recognized [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	117	481	268	414
Interest income recognized	1	2	13	15
Period End Loans No Allocated Allowance For Loan Losses [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	8,371	22,501	9,213	24,468
Interest income recognized	41	191	691	1,131
Allocated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	17,349	10,546	19,384	11,639
Interest income recognized	257	10	833	102
Average Recorded Investment and Income Recognized [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment	25,720	33,047	28,597	36,107
Interest income recognized	$ 298	$ 201	$ 1,524	$ 1,233