Note 3 - Loans (Detail) - Credit Quality Indicators (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Commercial & Industrial
Financing Receivable	$ 977,410	$ 983,909
Pass [Member] | Commercial and Industrial [Member]
Commercial & Industrial
Financing Receivable	129,842	122,812
Pass [Member] | Commercial Real Estate Loans [Member]
Commercial & Industrial
Financing Receivable	372,774	373,320
Watch Loan [Member] | Commercial and Industrial [Member]
Commercial & Industrial
Financing Receivable	11,682	19,542
Watch Loan [Member] | Commercial Real Estate Loans [Member]
Commercial & Industrial
Financing Receivable	54,479	56,571
Special Mention [Member] | Commercial and Industrial [Member]
Commercial & Industrial
Financing Receivable	5,885	7,878
Special Mention [Member] | Commercial Real Estate Loans [Member]
Commercial & Industrial
Financing Receivable	21,394	21,155
Substandard [Member] | Commercial and Industrial [Member]
Commercial & Industrial
Financing Receivable	2,175	2,928
Substandard [Member] | Commercial Real Estate Loans [Member]
Commercial & Industrial
Financing Receivable	8,305	5,686
Impaired Restructured and Accruing Loans [Member] | Commercial and Industrial [Member]
Commercial & Industrial
Financing Receivable	2,442	3,562
Impaired Restructured and Accruing Loans [Member] | Commercial Real Estate Loans [Member]
Commercial & Industrial
Financing Receivable	12,388	10,652
Impaired Restructured and Accruing Loans [Member] | First Lien Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	4,394	4,425
Impaired Restructured and Accruing Loans [Member] | Junior Lein Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	229	278
Impaired Restructured and Accruing Loans [Member] | Consumer Loans [Member]
Commercial & Industrial
Financing Receivable	174	0
Impaired Nonaccrual Loans [Member] | Commercial and Industrial [Member]
Commercial & Industrial
Financing Receivable	233	1,771
Impaired Nonaccrual Loans [Member] | Commercial Real Estate Loans [Member]
Commercial & Industrial
Financing Receivable	9,783	15,336
Doubtful [Member] | Commercial and Industrial [Member]
Commercial & Industrial
Financing Receivable	0	0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member]
Commercial & Industrial
Financing Receivable	454	0
Performing Financing Receivable [Member] | First Lien Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	203,711	199,117
Performing Financing Receivable [Member] | Junior Lein Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	60,011	66,169
Performing Financing Receivable [Member] | Consumer Loans [Member]
Commercial & Industrial
Financing Receivable	68,428	64,075
Loans more than 60 days past due [Member] | First Lien Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	2,793	2,203
Loans more than 60 days past due [Member] | Junior Lein Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	40	328
Loans more than 60 days past due [Member] | Consumer Loans [Member]
Commercial & Industrial
Financing Receivable	146	239
Nonaccrual loans [Member] | First Lien Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	4,995	5,374
Nonaccrual loans [Member] | Junior Lein Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	381	278
Nonaccrual loans [Member] | Consumer Loans [Member]
Commercial & Industrial
Financing Receivable	272	210
Commercial and Industrial [Member]
Commercial & Industrial
Financing Receivable	152,259	158,493
Commercial Real Estate Loans [Member]
Commercial & Industrial
Financing Receivable	479,577	482,720
First Lien Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	215,893	211,119
Junior Lein Residential Mortgage Loans [Member]
Commercial & Industrial
Financing Receivable	60,661	67,053
Consumer Loans [Member]
Commercial & Industrial
Financing Receivable	$ 69,020	$ 64,524