Note 4 - Loans (Details) - Risk Ratings - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 2,102,889	$ 1,804,819
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	85,340	77,140
Commercial Portfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	83,963	76,884
Commercial Portfolio Segment [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,106	65
Commercial Portfolio Segment [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	200
Commercial Portfolio Segment [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	71	191
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	556,118	529,093
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	549,353	519,274
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		7,610
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,882	1,906
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,883	303
Commercial Real Estate Portfolio Segment [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	296,452	222,537
Commercial Real Estate Portfolio Segment [Member] | Other Loan [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	293,949	219,997
Commercial Real Estate Portfolio Segment [Member] | Other Loan [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	900	900
Commercial Real Estate Portfolio Segment [Member] | Other Loan [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,603	1,640
Commercial Real Estate Portfolio Segment [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	101,801	107,345
Commercial Real Estate Portfolio Segment [Member] | Owner-occupied Loan [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	97,295	106,443
Commercial Real Estate Portfolio Segment [Member] | Owner-occupied Loan [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	3,904
Commercial Real Estate Portfolio Segment [Member] | Owner-occupied Loan [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	602	902
Commercial and Industrial Loans and Commercial Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,039,711	936,115
Commercial and Industrial Loans and Commercial Real Estate Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,024,560	922,598
Commercial and Industrial Loans and Commercial Real Estate Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,910	8,575
Commercial and Industrial Loans and Commercial Real Estate Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,082	1,906
Commercial and Industrial Loans and Commercial Real Estate Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,159	3,036
Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	972,523	779,994
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	967,773	777,846
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,034	1,066
Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	3,716	1,082
Residential Portfolio Segment [Member] | Revolving Home Equity Line [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	84,806	83,109
Residential Portfolio Segment [Member] | Revolving Home Equity Line [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	84,135	82,730
Residential Portfolio Segment [Member] | Revolving Home Equity Line [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		99
Residential Portfolio Segment [Member] | Revolving Home Equity Line [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	99
Residential Portfolio Segment [Member] | Revolving Home Equity Line [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	572	280
Consumer and Other Porfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,849	5,601
Consumer and Other Porfolio Segment [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,643	5,122
Residential Mortgages, Home Equity Lines, and Other Consumer Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,062,972	868,225
Residential Mortgages, Home Equity Lines, and Other Consumer Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,057,551	865,698
Residential Mortgages, Home Equity Lines, and Other Consumer Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,034	1,165
Residential Mortgages, Home Equity Lines, and Other Consumer Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	99
Residential Mortgages, Home Equity Lines, and Other Consumer Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 4,288	$ 1,362